# Jeju language

Jeju (Jeju: 제줏말; Jeju RR: Jejunmal, or Korean: 제주어; RR: Jejueo, or 제주말; Jejumal), often called Jejueo or Jejuan in English-language scholarship, is a Koreanic language originally from Jeju Island, South Korea. It is not mutually intelligible with mainland Korean dialects. While it was historically considered a divergent Jeju dialect of the Korean language, it is increasingly referred to as a separate language in its own right. It is declining in usage and was classified by UNESCO in 2010 as critically endangered, the highest level of language endangerment possible. Revitalization efforts are ongoing.
The consonants of Jeju are similar to those of Seoul Korean, but Jeju has a larger and more conservative vowel inventory. Jeju is a head-final, agglutinative, suffixing language like Korean. Nouns are followed by particles that may function as case markers. Verbs inflect for tense, aspect, mood, evidentiality, relative social status, formality, and other grammatical information. Korean and Jeju differ significantly in their verbal paradigms. For instance, the continuative aspect marker of Jeju and the mood or aspect distinction of many Jeju connective suffixes are absent in Korean. Most of the Jeju lexicon is Koreanic, and the language preserves many Middle Korean features and words now lost in Standard Korean. Jeju may also have a Peninsular Japonic substratum, but this argument has been disputed.
Jeju was already divergent from the Seoul dialect of Korean by the fifteenth century and unintelligible to mainland Korean visitors by the sixteenth century. The language was severely undermined by the aftermath of the Jeju uprising of 1948, the Korean War, and the modernization of South Korea. Many fluent speakers remaining in Jeju Island are now over seventy years old. Most people in Jeju Island now speak a variety of Korean with a Jeju substratum. The language may be somewhat more vigorous in a diaspora community in Osaka, Japan, as many Jeju people migrated to Osaka in the 1920s, but even there, younger members of the community tend to speak Japanese.

## Nomenclature and relationship to Korean

| 1995-1999 | 48 |
| 2000-2004 | 51 |
| 2005-2009 | 51 |
| 2010-2014 | 55 |
* Jeju language
* Jeju dialect
Source: :
Various terms in both Korean and English exist for the Jeju language, which also vary depending on whether it is considered a separate language or a dialect of Korean by the speaker.
Among native speakers, the term "Jeju speech" (제주말; Jejumal) is most commonly used. In English-language scholarship, it is often called Jejueo or Jejuan.

### Language or dialect distinction

Jeju is closely related to Korean. It was traditionally considered an especially divergent dialect of Korean, and as of 2019 is still referred to as such by the National Institute of Korean Language and the South Korean Ministry of Education.
Until the 2000s, South Korean academia preferred the term "Jeju dialect" (제주방언; Jeju bangeon). While the term "Jeju language" (제주어; Jejueo) was first used in 1947, it was not until the mid-1990s that the term gained traction. The majority of South Korean academic publications switched to using "Jeju language" by the early 2010s. Since somewhat earlier, "Jeju language" has also been the term preferred in local law, such as the 2007 Language Act for the Preservation and Promotion of the Jeju Language, and by non-governmental organizations working to preserve the language. The only English-language monograph on Jeju, published in 2019, consistently refers to it as a language as well.

#### Mutual intelligibility with modern South Korean Korean

Jeju is not mutually intelligible with even the southernmost dialects of South Korea. In a 2014 survey measuring intelligibility, Korean speakers from three different dialect zones (Seoul, Busan, and Yeosu) were exposed to one minute of spoken Jeju, with a control group of native Jeju speakers. On average, South Korean native speakers from all three dialect zones answered less than 10% of the basic comprehension questions correctly, while native Jeju speakers answered over 89% of the questions correctly. These results are comparable to the results of an intelligibility test of Norwegian for native Dutch speakers. Diaspora Jeju speakers living in Japan have also reported that they find it difficult to understand South Korean news media, and resort to Japanese subtitles when watching South Korean TV shows.

## Geographic distribution

Jeju was traditionally spoken throughout Jeju Province except in the Chuja Islands, halfway between Jeju Island and mainland Korea, where a variety of Southwestern Korean is found. The language is also used by some of the first- and second-generation members of the Zainichi Korean community in Ikuno-ku, Osaka, Japan.
Compared to mainland Korean dialect groups, there is little internal variation within Jeju. A distinction between a northern and southern dialect with a geographic divide at Hallasan is sometimes posited, but an eastern-western dialectal divide cutting through Jeju City and Seogwipo may better explain the few dialectal differences that do exist. A 2010 survey of regional variation in 305 word sets suggests that the north–south divide and the east–west divide coexist, resulting in four distinct dialect groups.
* An east–west divide is salient in the Jeju words for "lizard". Eastern Seogwipo uses 장쿨레비 jangkullebi while western Seogwipo uses 독다구리 dokdaguri.
* A north–south divide is more noticeable in the Jeju words for "crab".

## History
### Pre-modern history

The Koreanic languages are likely not native to Jeju Island; it has been proposed that the family has its roots in Manchuria, a historical region in northeastern Asia. It is thought that Koreanic speakers migrated from southern Manchuria between the third and eighth centuries CE. Linguist Alexander Vovin suggests that the ancient kingdom of Tamna, which ruled the island until the twelfth century, may have spoken a Japonic language that left a substrate influence on Jeju. When exactly this putative Japonic language may have been replaced by the Koreanic ancestor of Jeju remains unclear.
During the late thirteenth century, Jeju Island came under direct Yuan administration, which lead to significant migration of Mongol soldiers to the island. Acting as a superstratum, their language contributed to the change of the local language. Yang Changyong, a linguist, speculates that Mongol influence played a significant role in the formation of Jejueo as a distinct language independent from standard Korean.
By the fifteenth century, when the invention of Hangul greatly improved the understanding of Korean phonology, Seoul Korean and Jeju were already divergent; the Seoul prestige dialect of fifteenth-century Middle Korean disallowed the diphthong /jʌ/, which Jeju allows. Sixteenth- and seventeenth-century references to the language of Jeju by mainland Korean literati state that it was already unintelligible to mainland Koreans. Kim Sang-heon (1570—1652), who from 1601 to 1602 served as the island's pacification commissioner, gives six words in the "provincial language" with clear cognates in modern Jeju and also writes:
   謫人 申長齡 乃譯官也 嘗曰 「比島語音 酷以中華 如驅牛馬之聲 尤不可分辯云云 盖風氣與華不隔而然耶 曾爲元朝所據置官於此故與華相雜而然耶」... 所謂俚語者 但高細不可曉
   "The exiled man Shin Jangnyeong was originally a government interpreter. He said, 'The language of this island is most like Chinese, and the sounds they make while driving cattle and horses are yet more impossible to tell apart. Is this because the climate is not far from that of China, or because the Yuan dynasty once ruled and appointed officials here and the Chinese mingled with them?'... What is called the provincial language is but high and thin and cannot be understood."
In 1629, the Korean government banned the emigration of Jeju Islanders to the mainland, further restricting linguistic contacts between Jeju and Korean. At the same time, the island was also used throughout the Joseon era (1392—1910) as a place of exile for disgraced scholar-officials. These highly educated speakers of Seoul Korean often tutored the children of their Jeju neighbors during their exile and established a continuous and significant Seoul Korean superstratum in Jeju.

### Japanese colonial period (1910–1945)

Under the Japanese colonial rule, Jejueo remained the dominating language in both public and private spheres on Jeju Island. However, with the entrance of Japanese loanwords to the lexicon, some speakers became monolingual Japanese speakers. Migration of Jeju Islanders to Japan began to skyrocket in 1911, with significant communities established, more so in cities like Osaka, becoming home to 38,000 Jeju Islanders by 1911. Despite gaining independence, citizens of Jeju and Korea still migrated to Japan, continuing to impact the linguistic landscape of Jeju Island as the younger generations within the diaspora communities only spoke Japanese, leading the decline in fluency in Jejueo.

### Modern period and decline (1945–present)

Severe disruption to the Jeju language community began after the end of Japanese rule and World War II in 1945. Korea was divided between an American government in the South and a Soviet government in the north, which were succeeded by South Korea and North Korea correspondingly in 1948. Popular opposition to the division and many other issues led to a rebellion on Jeju island on 3 April 1948. The Syngman Rhee regime suppressed the rebellion with mass killings of civilians. As many as 60,000 Jeju Islanders, or a full fifth of the pre-rebellion population, were killed. 40,000 more fled to Japan. Out of the 400 villages of the island, only 170 remained.
The devastating impact of the massacres on the Jeju language community was exacerbated by the outbreak of the Korean War in 1950. While Jeju was never occupied by the North Korean army, nearly 150,000 Korean-speaking refugees from the mainland fleeing North Korean invasion arrived in Jeju in the first year of the war.
The above events shattered the Jeju language's former dominance on the island, and Standard Korean began to displace Jeju in the public sphere by the 1950s. The 1970s Saemaeul Undong, an ambitious rural modernization program launched by Park Chung Hee, disrupted the traditional village community where Jeju had thrived. The language came to be perceived as an incorrect dialect of Korean; students were even subject to corporal punishment if they used it in school. Standard Korean became more commonplace in private settings even outside of Jeju City. The language attitude of native Jeju speakers in this period was self-disparaging, and even Jeju people regarded the use of Jeju "with contempt". A 1981 survey of language attitudes among high school and university students natively speaking Seoul Korean, Chungcheong Korean, Southwestern Korean, Southeastern Korean, and Jeju showed that Jeju speakers were the most likely among the five groups to ascribe negative traits to their native variety.
A 1992 study of code-switching by native Jeju speakers shows that Jeju was by then in an unfavorable diglossic relationship with Korean, and was largely restricted to informal contexts even between Jeju natives. Within a primarily Jeju conversation, Standard Korean was used to emphasize the rationality or truth value of statements. Switching to Jeju in a primarily Standard Korean conversation signified that the speaker was making a subjective statement or being less serious.
Code-switching rules in early 1990s Jeju :
| Participants | Formality | Intimacy | Social status | Preferred variety |
| Includes mainlander | | | | Standard Korean |
| Only Jeju natives | Formal | | | | Standard Korean |
| Only Jeju natives | Informal | Participants are not emotionally intimate | Speaker is socially inferior to addressee | Standard Korean |
| Only Jeju natives | Informal | Participants are not emotionally intimate | Speaker is socially superior to addressee | Jeju / Jeju Korean |
| Only Jeju natives | Informal | Participants are emotionally intimate | | Jeju / Jeju Korean |
The same study notes that by 1992, even this variety restricted to the informal domain was usually a Korean dialect with a Jeju substratum, rather than the traditional Jeju language:
   현재 상용되는 제주말의 경우, 표준말과의 차이가 과거에 비해 크게 줄어들고 있는 상황으로써 특히 어미활용에서 표준말과의 차이가 극대화되며, 다른 부분에서는 상대적으로 표준말과의 차이가 극소화된다는 점이다. 따라서 제주사람들은 과거 사용되던 토박이 말에 가까운 것은 '진한 (심한) 제주말'로, 현재 사용되는 제주말은 '옅은 제주말' 또는 '(표준어와) 섞어진 말'로 표현하는 등, 제주말과 표준말이 일종의 방언 연속체를 형성하는 것으로 인식하고 있다.
   "As for the Jeju language [lit. 'Jeju speech'] in general use nowadays [as of 1992], the situation is that its differences from Standard Korean are greatly diminishing compared to the past. Its greatest differences with Standard Korean [now] lie especially in the suffix paradigm, and in other areas the differences are being minimized. The Jeju people accordingly understand that Jeju and Standard Korean are in a form of dialect continuum, and refer to the native language formerly in use as "thick (or intense) Jeju language" and the Jeju language currently in use as "light Jeju language" or "mixed (with Korean) language."

## Current status and ongoing endangerment

Since 2010, UNESCO has classified Jeju as a critically endangered language, defined as one whose "youngest speakers are grandparents and older... [who] speak the language partially and infrequently." In 2018, the Endangered Languages Archive at SOAS University of London collected audio and video recordings of native Jeju speakers having everyday conversations, singing traditional songs, and performing rituals.
The official language of South Korea is Standard Korean. Nearly all residents of Jeju Island are bilingual in Standard Korean and Jeju, while many younger individuals are even more fluent in English than in Jeju. Standard Korean is most commonly used in the majority of public areas, while Jeju tends to be reserved for use at home and a few local markets. All schools located on Jeju Island are required to teach Standard Korean and only offer Jeju as an elective course. In addition, many Jeju Islander migrate to mainland Korea for a number of various reasons such as education, employment, and marriage contributing to decline of the Jejueo language. As a result, there are currently no monolingual speakers of Jeju.
The distinctive phonological, syntactic, and lexical features of the Jeju Island language, known as Jejueo or Jeju dialect, compared to Standard Korean, pose obstacles to effective communication. Phonological differences, such as variations in pitch accent and vowel distinctions, may lead to misunderstandings or difficulties in comprehension between Jeju natives and speakers of Standard Korean. Communication can also be made more difficult by syntactic variances, word order flexibility, and particle usage inconsistencies between Standard Korean and Jejueo. In contrast to the mainstream linguistic rules observed in mainland Korean, Jejueo maintains earlier grammatical structures and syntactic patterns that may lead to misunderstandings or confusion during conversations.
As of 2018, fluent speakers in Jeju Island were all over seventy years of age, while passive competence was found in some people in their forties and fifties. Younger Islanders speak Korean with Jeju substrate influence found in residual elements of the Jeju verbal paradigm and in select vocabulary such as kinship terms. The language is more vigorous in Osaka, where there may be fluent speakers born as late as the 1960s.
A 2008 survey of adult residents' knowledge of ninety Jeju cultural words showed that only twenty-one were understood by the majority of those surveyed. Lack of heritage knowledge of Jeju is even more severe among younger people. In 2010, 400 Jeju teenagers were surveyed for their knowledge of 120 basic Jeju vocabulary items, but only 19 words were recognized by the majority while 45 words were understood by less than 10%. A 2018 study suggests that even the verbal paradigm, among the more resilient parts of the substratum, may be in danger; the average middle schooler was more competent in the verb system of English, a language "taught only a few hours a week in school and in private tutoring institutions", than of Jeju.

### Local attitudes towards Jeju

Historically, the Jeju language was seen as impolite or uncultured. Jeju uses fewer honorifics and has four levels of politeness, in comparison to the seven levels in Standard Korean. Because of the linguistic differences and cultural differences, Jeju Islanders were marginalized and excluded among mainland Koreans. In a 2011 Korea Times article, a student said they believed the language was not respectful enough to use with professors, and that the Seoul dialect was more sophisticated. In addition, Jeju is often associated with the countryside, as the majority of speakers tend to have traditional occupations, including farming, fishing, and diving. As a result, many younger children express a disinterest in learning the language.

#### Improving sentiment

However, recent surveys show improved sentiment towards the Jeju language. In a National Institute of the Korean Language survey in 2005, only 9.4% of Jeju Islanders were very proud of the regional variety. When the same survey was readministered in 2015, 36.8% were very proud of the language, and Jeju Islanders had become the most likely among South Korean dialect groups to have "very positive" opinions of the regional variety. In a 2017 study of 240 Jeju Islanders, 82.8% of those sampled considered Jeju to be "nice to listen to", and 74.9% hoped that their children would learn the language. But significant generational differences in attitudes were also observed. For instance, only 13.8% of Jeju Islanders between 20 and 40 much preferred Jeju over Standard Korean, while 49.1% of those above 80 did.
In a 2013 survey of Jeju natives, 77.9% agreed with the statement that "[the Jeju language] has to be passed down as part of Jeju culture." But a 2015 study of approximately 1,000 Jeju Islanders suggests that even though most Jeju Islanders believe the language to be an important part of the island's culture, the vast majority are skeptical of the language's long-term viability, and more people are unwilling than willing to actively participate in language preservation efforts.

### Revitalization efforts

Revitalization efforts have been ongoing.

#### Government efforts

On 27 September 2007, the Jeju provincial government promulgated the Language Act for the Preservation and Promotion of the Jeju Language, which established five-year plans for state-backed language preservation. The Act encouraged public schools on Jeju Island to offer Jeju as an extracurricular activity, as well as to incorporate the language as a part of regular classes if relevant and feasible. In addition, multiple programs were provided for adults. For example, adult language programs are offered every year at the Jeju National University and are free of charge. There are also several local centres on Jeju Island that offer classes in Jeju Language specifically to marriage-based immigrants.
However, it was not until UNESCO's 2010 designation of Jeju as critically endangered that the provincial government became proactive in Jeju preservation efforts. In 2016, the provincial government allotted ₩685,000,000 (US$565,592 in 2016) to revitalization programs, and the government-funded Jeju Research Institute has compiled phrasebooks of the language. The provincial Ministry of Education has also published Jeju textbooks for elementary and secondary schools, although some textbooks really teach Standard Korean interspersed with Jeju lexical items. Some public schools offer after-school programs for Jeju, but the short duration of these classes may be insufficient to promote more than "symbolic" use by students. The linguistic competence of many teachers has also been challenged.
On 12 August 2011, the Research Centre for Jeju Studies was opened with the purpose of implementing projects for the revitalization and safeguarding of Jeju Language. The project encouraged the promotion of Jeju Language in schools by tasking the Education Bureau with several initiatives, including a training program for teachers. The project also started a radio broadcast in Jeju Language, as well as a radio campaign for Jeju slang and an annual Jeju Language festival. An iPhone application was developed, including a glossary, as well as a collection of proverbs, poems, and quizzes in Jeju Language. Finally, an introductory conversation brochure was distributed to both citizens and visitors of Jeju Island.

#### Popular media efforts

The Jeju Language Preservation Society, founded in December 2008, publishes a bimonthly Jeju-language magazine Deongdeureong-makke (덩드렁마께) and holds Jeju teaching programs and speaking contests. Children's books and a 2014 poetry anthology have also been published. Local bands and theater troupes have made Jeju-language performances. Regional newspapers such as the Jemin Ilbo and the Halla Ilbo include Jeju-language sections.
Local branches of KBS and MBC have launched Jeju radio programs and a television series. Recent South Korean media with nationwide appeal, including the 2010 television series Life is Beautiful and The Great Merchant, the 2012 drama film Jiseul, and the 2015 television series Warm and Cozy, have also featured spoken Jeju.

## Cultural differences

In addition to the difference in language and dialect, Jeju Islanders and mainland Koreans share a number of cultural differences.
The historical isolation and unique identity of Jeju Island, which have nourished a strong sense of regional pride and unity among Jeju inhabitants, are two significant cultural differences. Jeju Island's distinct cultural traditions, folk beliefs, and practices set it apart from the Korean mainland are a result of the island's geographic isolation. For example, Jeju's traditional women divers, or haenyeo, represent the ideals of resiliency, collaboration, and environmental care and represent the island's matriarchal legacy and collective spirit.
Moreover, Jeju Island's tumultuous history, including the Jeju rebellion and subsequent mass killings, has left a profound impact on the collective memory and social identity of Jeju Islanders. The trauma and scars of historical events continue to resonate in the cultural consciousness, shaping perceptions, attitudes, and behaviors among Jeju natives. These experiences have contributed to a distinct sense of identity and solidarity among Jeju Islanders, often manifesting in cultural expressions, artistic forms, and community rituals that reflect resilience and resistance against oppression.
Religious practices on Jeju Island encompass a diverse range of beliefs, including shamanism, Buddhism, and Christianity, each contributing to the island's rich religious heritage and spiritual landscape. These religious traditions intersect with cultural rituals and festivals, such as the annual Jeju Fire Festival and Seongsan Sunrise Festival, which celebrate Jeju's natural beauty, cultural heritage, and community solidarity.

## Orthography

Jeju has historically had no written language. Two recently devised standard orthographies are currently in use: a system created in 1991 by scholars of the Jeju Dialect Research Society, and a system promulgated by the provincial government in 2014. Both systems use the Korean alphabet Hangul with one additional letter ㆍ, which was used in the Middle and Early Modern Korean scripts but is now defunct in written Korean. Similar to the modern Korean script, Jeju orthographies have morphophonemic tendencies, meaning that transcribing the underlying morphology generally takes precedence over the surface form. The two orthographies differ largely because they are based on different morphological analyses of the language, especially of the verbal paradigm, as seen in the example below.
| Orthography | Underlying morphemes | Underlying morphemes | Underlying morphemes | Jeju word | Necessary analysis |
| Research Society orthography | 나끄-nakkeu-나끄-nakkeu-"to fish" | -엄시-eomsiCONT-엄시-eomsiCONT | -민-minCOND-민-minCOND | 나껌시민nakkeomsimin나껌시민nakkeomsimin"if [he] is fishing" | Stem-final vowel -eu is lost before vowel-initial suffix |
| Government orthography | 낚-nakk-낚-nakk-"to fish" | -어ᇝ-eomsCONT-어ᇝ-eomsCONT | -민-minCOND-민-minCOND | 낚어ᇝ이민nakkeomsimin낚어ᇝ이민nakkeomsimin"if [he] is fishing" | Conditional suffix -min requires epenthetical vowel -i- after consonant |
This article will use the government's orthography where the two differ.

### Transliteration or romanization

The transliteration scheme generally used in Korean linguistics, including when transcribing Jeju, is the Yale Romanization system. Yang C., Yang S., and O'Grady 2019 instead uses a variant of the Revised Romanization system with the addition of the sequence aw for ㆍ /ɒ/.
This article also uses Revised Romanization with the addition of aw, but without Yang C., Yang S., and O'Grady 2019's one-to-one correspondence between Hangul glyphs and the Latin alphabet.

## Phonology
### Consonants

The non-approximant consonants of Jeju correspond to the nineteen non-approximant consonants of Standard Korean, and Jeju displays the three-way contrast between stops and affricates characteristic of Modern Korean. Whether the voiced glottal fricative /ɦ/, absent in Standard Korean, exists as a phoneme in Jeju or merely as an allophone of /h/ remains disputed. A 2000 acoustic and aerodynamic study of eight native Jeju speakers concludes that "the consonants of the two languages seem to be the same in every respect... the phonetic realization of all [Jeju] consonants are the same as those found in [Seoul] Korean."
Consonant phonemes :
| | | Bilabial | Alveolar | (Alveolo-) Palatal | Velar | Glottal |
| Nasal | Nasal | m ㅁ | n ㄴ | | ŋ ㅇ | |
| Stop and affricate | lax | p ㅂ | t ㄷ | tɕ ㅈ | k ㄱ | |
| Stop and affricate | tense | p͈ ㅃ | t͈ ㄸ | t͈ɕ ㅉ | k͈ ㄲ | |
| Stop and affricate | aspirated | pʰ ㅍ | tʰ ㅌ | tɕʰ ㅊ | kʰ ㅋ | |
| Fricative | lax/aspirated | | s ㅅ | | | h ㅎ (ɦ ㅇ) |
| Fricative | tense | | s͈ ㅆ | | | |
| Liquid | Liquid | | l~ɾ ㄹ | | | |
| Approximant | Approximant | w | | j | (ɰ) | |

#### Consonantal phonological processes

Jeju allophony involves a number of phonological processes also found in Seoul Korean. As in Korean, /l/ surfaces as [ɾ] intervocally. Also as in Korean, lax stops and affricates have fully voiced allophones in medial position, all obstruents have unreleased allophones in final position, and syllable-final sibilants surface as [t̚]. Whether non-lax stops and affricates can appear in final position is controversial. The morphological analysis necessary for the government's orthography permits them, while the analysis behind the Jeju Language Research Society's orthography forbids them.
| Lax obstruent | ㄱ g | ㄷ d | ㅅ s | ㅈ j | ㅂ b |
| Initial allophone | k~kʰ | t~tʰ | s | tɕ~tɕʰ | p~pʰ |
| Medial allophone | ɡ | d | s~z | dʑ | b |
| Final allophone | k̚ | t̚ | t̚ | t̚ | p̚ |
Most non-morphophonological consonant assimilation rules of Standard Korean are also found in Jeju. /s/ and /s͈/ are regularly palatalized to [ʃ] before /i/ or /j/. Lax obstruents are tensed following another obstruent. /h/ aspirates both the preceding and the subsequent lax obstruent. A nasal consonant nasalizes a preceding obstruent or /h/. /l/ becomes [n] following all consonants except itself or /n/, and this [n] can itself nasalize the preceding obstruent so that the underlying sequence /pl/ is realized as [mn]. On the other hand, underlying /ln/ and /nl/ both produce [ll].
Non-morphophonological consonant allophony :
| Jeju word | Underlying phonemes | Realization | |
| 심 "strength" | /sim/ | [ʃim] | Palatalization before high vowel /i/ |
| 역불 "on purpose" | /jəkpul/ | [jək̚p͈ul] | Lax obstruent tensed after another obstruent |
| 밧갈쉐 "ox" | /paskalswe/ | [pat̚k͈alswe] | Lax obstruent tensed after another obstruent |
| 흡헬귀 "bloodsucker" | /hɨphelkwi/ | [hɨpʰelɡwi] | /h/ aspirates surrounding obstruents |
| 돗늬 "pig's tooth" | /tosn(ɰ)i/ | [tonni] | Nasals nasalize preceding obstruent |
| 녹낭 "camphor tree" | /noknaŋ/ | [noŋnaŋ] | Nasals nasalize preceding obstruent |
| 섭낭 "firewood" | /səpnaŋ/ | [səmnaŋ] | Nasals nasalize preceding obstruent |
| 멩랑 "cleverness" | /meŋlaŋ/ | [meŋnaŋ] | /l/ is realized as [n] after most consonants; underlying /l/ will nasalize preceding obstruent |
| 섭력 "cooperation" | /səpljək/ | [səmnjək̚] | /l/ is realized as [n] after most consonants; underlying /l/ will nasalize preceding obstruent |
| 칼ᄂᆞᆯ "blade" | /kʰalnɒl/ | [kʰallɒl] | /l/ assimilates both preceding and subsequent /n/ |
| 곤란 "difficulty" | /konlan/ | [kollan] | /l/ assimilates both preceding and subsequent /n/ |
Jeju also has consonant allophones that appear only at morpheme boundaries. Some of these are found in Standard Korean, such as the insertion of [n] before i- or j- at most word-internal morpheme boundaries; the palatalization of /t/ to [dʑ] before an affixal -i; and the tensing of obstruents following certain morpheme-final nasals. Other rules are absent in Standard Korean. For instance, a sonorant-final word or morpheme can trigger aspiration (for older speakers) or tensing (for younger speakers) in a subsequent lax consonant. In some cases this is due to an underlying consonant cluster, but not all cases can be explained in this way. Other Jeju-specific processes include the doubling of a word-final consonant when followed by a vowel, glide, or /h/, and the lenition of /p/ to [w] at some word boundaries.
Consonant allophony at morpheme boundaries :
| Jeju word (morphemes hyphenated) | Underlying phonemes | Realization | |
| 쏙입 ssog-ip "inner leaf" | /s͈okip/ | [s͈oŋnip̚] | n-insertion before /i/ |
| ᄆᆞᆮ이 mawd-i "eldest child" | /mɒti/ | [mɒdʑi] | /t/ palatalized before /i/, voiced in medial position |
| 검수다 keom-su-da "to be black" [honoring addressee] | /kəmsuta/ | [kəms͈uda] | Obstruent tensed after verb stem-final nasal |
| 술벵 sul-beng "alcohol bottle" | /sulpeŋ/ | [sulpʰeŋ] | Aspiration after sonorant (for older speakers) |
| 빵집 ppang-jip "bakery" | /p͈aŋtɕip/ | [p͈aŋtɕʰip̚] | Aspiration after sonorant (for older speakers) |
| 일월 il-weol "January" | /ilwəl/ | [illwəl] | Consonant doubling |
| 지집아이 jijib-ai "girl" | /tɕitɕipai/ | [tɕidʑip̚p͈ai] | Consonant doubling |
| 대왓 (from 대+밧 dae-bat) "bamboo field" | /tæpat/ | [tæwat̚] | Lenition of /p/ |
Verbal conjugation can also lead to consonantal changes. Verb stem-final /l/ and /h/ are lost before /n/. In the case of verb stems ending in -d, -p. -s, and -k, the final consonants are always preserved in so-called regular verbs, but in irregular verbs, -d and -p are lenited to [ɾ] and [u~w] respectively while -s and -k are lost when followed by a vowel.
Final-consonant allomorphy in irregular verbs :
| Underlying morphemes | Underlying morphemes | Surface realization | Regular verb |
| ᄃᆞᆮ- dawd- "to run" | -곡 -gok CONN | ᄃᆞᆮ곡 dawt-gok "runs, and" | 받곡 bat-gok "receives, and" |
| ᄃᆞᆮ- dawd- "to run" | -아 -a SE | ᄃᆞᆯ아 dawr-a "runs" | 받아 bad-a "receives" |
| 빕- bib- "to pour" | -곡 -gok CONN | 빕곡 bip-gok "pours, and" | 입곡 ip-gok "wears, and" |
| 빕- bib- "to pour" | -어 -eo SE | 비워 biw-eo "pours" | 입어 ib-eo "wears" |
| 짓- jis- "to compose writing" | -곡 -gok CONN | 짓곡 jit-gok "composes writing, and" | 짓곡 jit-gok "builds, and" |
| 짓- jis- "to compose writing" | -어 -eo SE | 지어 ji-eo "composes writing" | 짓어 jis-eo "builds" |
| 눅- nug- "to lie down" | -곡 -gok CONN | 눅곡 nuk-gok "lies down, and" | 먹곡 meok-gok "eats, and" |
| 눅- nug- "to lie down" | -어 -eo SE | 누어 nu-eo "lies down" | 먹어 meog-eo "eats" |

#### Underlying consonant clusters

While not permitted in the surface representation of Jeju, morpheme-final consonant clusters can exist in the underlying form. Many cases of post-sonorant aspiration involve morphemes whose Middle Korean cognates feature a final -h, suggesting that an underlying final -h after the sonorant should be posited in Jeju as well. Besides these h-final clusters, Jeju permits a number of other final consonant clusters, including -lk, -lm, -mk~ŋk, -sk, and (in the analysis of the government's orthography) -ms. These clusters surface as a single consonant in isolation or before a consonant, but are fully realized when followed by a vowel.
Realization of final consonant clusters :
| Underlying form | Realization in isolation/before consonant | Realization before vowel |
| ᄇᆞᆰ-/pɒlk/ᄇᆞᆰ-/pɒlk/"to be bright" | ᄇᆞᆰ고[pɒk̚k͈o]ᄇᆞᆰ고[pɒk̚k͈o] | ᄇᆞᆰ언[pɒlɡən]ᄇᆞᆰ언[pɒlɡən] |
| 삶/salm/삶/salm/"life" | 삶[sam]삶[sam] | 삶이[salmi]삶이[salmi] |
| 나ᇚ/namk~~나ᇬnaŋk~~낭naŋ/나ᇚ ~ 나ᇬ ~ 낭/namk ~ naŋk ~ naŋ/"tree" | 남[nam~~낭naŋ]남 ~ 낭[nam ~ naŋ] | 남기[namɡi~~낭기naŋɡi~~낭이naŋi]남기 ~ 낭기 ~ 낭이[namɡi ~ naŋɡi ~ naŋi] |
| -어ᇝ/əms/CONT-어ᇝ/əms/CONT | 데껴ᇝ가[tek͈jəmɡa]데껴ᇝ가[tek͈jəmɡa] | 데꼄서[tek͈jəmsə]데꼄서[tek͈jəmsə] |
| 바ᇧ/pask/바ᇧ/pask/"outside" | 바ᇧ[pat̚]바ᇧ[pat̚] | 밧기[pat̚k͈i]밧기[pat̚k͈i] |

### Vowels

Jeju traditionally has a nine-vowel system: the eight vowels of Korean with the addition of ㆍ /ɒ/, a Middle Korean phoneme lost in Seoul in the eighteenth century. The Jeju-do dialect is known to exhibit more conservative vowel sounds preserving older vowel distinctions, compared to standard Korean.
Vowel phonemes :
| | Front | Front | Central | Central | Back | Back |
| Close | ㅣ i | /i/ | ㅡ eu | /ɨ/ | ㅜ u | /u/ |
| Mid | ㅔ e | /e/ | ㅓ eo | /ə/ | ㅗ o | /o/ |
| Open | ㅐ ae | /æ/ | ㅏ a | /a/ | ㆍ aw | /ɒ/ |
The phonemic identity of ㆍ is controversial, but native speakers most commonly realize the phoneme as [ɔ]. /æ/ and /e/ are only distinguished in the initial syllable.
Among younger and less fluent speakers, /æ/ and /ɒ/ have both raised to /e/ and /o/ or /ə/ respectively, resulting in a seven-vowel system identical to the vowel inventory of Seoul Korean. The raising of Jeju /æ/ occurred before the raising of /ɒ/, and may have predated Standard Korean's ongoing merger of /æ/ and /e/. The subsequent loss of /ɒ/ may have been motivated by a language-internal desire for symmetry in the vowel system. On the other hand, the vowel mergers are accelerated among Jeju speakers living in coastal communities more exposed to Standard Korean.
Jeju has two or three glides: /j/, /w/, and possibly /ɰ/. /j/ can occur with all vowels except /i/ and /ɨ/. /jæ/ and /je/ have merged even among speakers who distinguish the monophthongs, and many speakers who retain /ɒ/ also merge /jɒ/ with /jə/. /w/ cannot occur with the three back vowels or with /ɨ/. /ɰ/ occurs only with /i/, and the resulting diphthong /ɰi/ is generally realized as [ɨ] word-initially and [i] otherwise.
Glide-vowel sequences may be analyzed as diphthongs, with the phonemic identities of [j], [w], and [ɰ] being /i/, /o~u/, and /ɨ/ respectively.
| IPA | Hangul | Example | Example |
| /je/ | ㅖ, ㅒ | 예숙제낄락 yesukjekkillak | "quiz; riddle" |
| /ja/ | ㅑ | 야개기 yagaegi | "neck" |
| /jo/ | ㅛ | 요레 yore | "here; this place" |
| /ju/ | ㅠ | 유ᄒᆞᆨ yuhawk | "Confucianism" |
| /jə/ | ㅕ | 역ᄉᆞ yeoksaw | "history" |
| /jɒ/ | ᆢ | ᄋᆢ라 yawra | "several" |
| /wi/ | ㅟ | 위염 wiyeom | "danger" |
| /we/ | ㅞ, ㅙ, ㅚ | 웬착 wenchak | "left side" |
| /wa/ | ㅘ | 와리다 warida | "to be in a hurry" |
| /wə/ | ㅝ | 월력 weollyeok | "calendar" |
| /ɰi/ | ㅢ | 의남 uinam~eunam | "fog" |

#### Vowel phonological processes

Several phonological processes affect the surface realization of Jeju vowels. In one process shared with Standard Korean, a bisyllabic vowel sequence may be contracted to a monosyllabic polyphthong.
| English | Uncontracted Jeju form | Contracted Jeju form |
| "it was caught" | 젭히엇저 jepieotjeo | 젭혓저 jepyeotjeo |
| "cucumber" | 오이 oi | 웨 we |
Vowel-affecting processes are particularly numerous in the verbal paradigm. Verb stem-final -eu is lost before a vowel-initial suffix. Similar to Standard Korean, a stem-final -i diphthongizes a subsequent vowel by inserting the onglide [j]. Unlike in its sister language, Jeju j-insertion may occur even with an intervening consonant, and between a verb stem ending in -e, -ae, or -aw and a suffix with initial eo-.
Many of Jeju's consonant-initial verbal suffixes take an initial epenthetic vowel if the previous morpheme ends with a consonant. The default epenthetic vowel is -으- -eu- /ɨ/, but the vowel surfaces as -이- -i- [i] following a sibilant and as -우- -u- [u] following an underlying labial.
Vowel shifts in conjugated verbs :
| English | Underlying morphemes | Underlying morphemes | Underlying morphemes | Surface realization |
| "is sad, and" | 슬프- seulpeu- "to be sad" | -엉 -eong CONN | -엉 -eong CONN | 슬펑 seulp-eong |
| "rests, and" | 쉬- swi- "to rest" | -엉 -eong CONN | -엉 -eong CONN | 쉬영 swi-yeong |
| "was fast" | 제- je- "to be fast" | -엇 -eos PFV | -어 -eo SE | 제엿어 je-yeos-eo |
| "mixed with water" | 개- gae- "to mix with water" | -엇 -eos PFV | -어 -eo SE | 개엿어 gae-yeos-eo |
| "did" | ᄒᆞ haw- "to do" | -엇 -eos PFV | -어 -eo SE | ᄒᆞ엿어 haw-yeos-eo |
| "if [it] burns" | 카- ka- "to burn" | -민 -min COND | -민 -min COND | 카민 ka-min |
| "if [he] believes" | 믿- mid- "to believe" | -민 -min COND | -민 -min COND | 믿으민 mid-eumin |
| "if [it] is bad" | 줏- jus- "to pick" | -민 -min COND | -민 -min COND | 줏이민 jus-imin |
| "if [he] puts in the soup" | ᄌᆞᆷ- jawm- "to put into soup" | -민 -min COND | -민 -min COND | ᄌᆞᆷ우민 jawm-umin |
Like Standard Korean but unlike Middle Korean, Koreanic vowel harmony is no longer generally applicable in all native morphemes but remains productive in sound symbolism and certain verbal suffixes. Jeju has two harmonic classes, yin and yang. The neutral vowel /i/ can occur with either class.
| Harmonic class | Vowel correspondences | Vowel correspondences | Vowel correspondences | Vowel correspondences | Sound symbolism |
| Yin | ə | u | e | ɨ | Dark; heavy; dull; negative |
| Yang | a | o | æ | ɒ | Bright; light; sharp; positive |
| Neutral | i | i | i | i | — |
For instance, the perfective aspect marker -엇 -eos takes the vowel harmonic allomorph -앗 -as after verb stems whose (final) vowel is yang:
| Yin-class allomorph | Yang-class allomorph |
| 먹엇어 meog-eos-eo "ate" | 갈앗어 gar-as-eo "plowed" |
| 궂엇어 guj-eos-eo "was bad" | 곱앗어 gob-as-eo "hid" |
| 긋엇어 geus-eos-eo "drew a line" | ᄃᆞᆯ앗어 dawr-as-eo "ran" |
| 싯엇어 sis-eos-eo "washed" ||
In certain cases, suffix allomorphs do not match the harmonic class of the previous vowel. Verb stems with final vowel /u/ or /ɨ/ take the yang allomorph if their Middle Korean forms were /ɒ/, thus conserving their original harmonic class while violating their current one. Disyllabic stems that end in -u also take the yang allomorph, but monosyllabic -u stems or disyllabic -uC stems do not.

### Phonotactics

Jeju syllable structure is (C)(G)V(C) with G being a glide.
| Syllable structure | Jeju | IPA |
| V | 이 i "this" | [i] |
| CV | 따 tta "earth" | [t͈a] |
| GV (or VV) | 웨 we "cause; principle" | [we] |
| CGV (or CVV) | 쉬 swi "filling" [for dumplings, etc.] | [swi] |
| VC | 알 al "egg" | [al] |
| CVC | ᄀᆞᆺ kawt "edge" | [kɔt̚] |
| GVC (or VVC) | 윳 yut "neighbor" | [jut̚] |
| CGVC (or CVVC) | 광 kwang "lunatic" | [kwaŋ] |
As in Standard Korean, ng- /ŋ/ cannot occur syllable-initially, and l- /l/ does not occur word-initially in native words.

### Prosody

Jeju does not have phonemic vowel length, stress, or tone. Its phonological hierarchy is characterized by accentual phrases similar to those of Standard Korean, with a basic Low-High-Low-High tonal pattern varying according to sentence type, but there are also important differences in the two languages' prosody. Jeju has a weaker tonal distinction within the first half of the accentual phrase than Seoul Korean does, while its aspirate consonants do not produce as significant a high pitch as their Seoul equivalents. Jeju uses more contour tones, where the pitch shifts within a single syllable, than Seoul Korean. Unlike in Seoul Korean, older and fluent speakers of Jeju will also lengthen the final vowel of both clauses in alternative questions.

## Grammar

ORD: ordinal numeral INTR: interrogative MED: medial demonstrative SE: sentence ender CE: canonical ending REP : reportive NPST: nonpast
Jeju is typologically similar to Korean, both being head-final agglutinative languages. However, the two languages show significant differences in the verbal paradigm, such as Jeju's use of a dedicated conditional suffix.

### Nouns

Jeju nouns may be a single morpheme, a compound of multiple nouns, or a base noun with a merged attributive verb, or form through derivational affixes attached to nouns or verb stems. In compound nouns that include a native morpheme, the phoneme -s- may intervene between the two elements. Because this "in-between s" appears only after a vowel and before a consonant, it is never realized as [s] but almost always surfaces as [t̚].
* Single-morpheme noun: 쉐 swe "cattle"
* Noun compound:
쉐
swe
"cattle"
궤기
gwegi
"meat"
쉐궤기
swe-gwegi
"beef"
쉐 + 궤기 → 쉐궤기
swe gwegi swe-gwegi
"cattle" "meat" "beef"
* Noun compound with -s-:
다리
dari
"leg"
빙
bing
"illness"
다릿빙
dari-t-bing
"leg illness"
다리 + 빙 → 다릿빙
dari bing dari-t-bing
"leg" "illness" {"leg illness"}
* Noun with merged attributive verb:
앚-
aj-
"to sit"
일
il
"work"
앚인일
aj-in-il
"work done while sitting"
앚- + 일 → 앚인일
aj- il aj-in-il
{"to sit"} "work" {"work done while sitting"}
* Noun derived from noun through affix:
ᄌᆞᆷ
jawm
"sleep"
ᄌᆞᆷ주시
jawm-jusi
"sleepyhead"
ᄌᆞᆷ → ᄌᆞᆷ주시
jawm jawm-jusi
"sleep" "sleepyhead"
* Noun derived from verb through affix:
먹-
meog-
"to eat"
먹쉬
meog-swi
"glutton"
먹- → 먹쉬
meog- meog-swi
{"to eat"} "glutton"
* Verbal noun:
ᄃᆞᆺ-
daws-
"to be warm"
ᄃᆞᆺ임
daws-im
"warmth"
ᄃᆞᆺ- → ᄃᆞᆺ임
daws- daws-im
{"to be warm"} "warmth"
(Examples from Yang C., Yang S, and O'Grady 2019 and Ko J. 2011a)
Some Jeju nouns are bound nouns, meaning that they cannot appear independently without a noun phrase. The example below features the bound noun 침 chim "worth" accompanied by the obligatory attributive verb.
   볼
   bo-l
   see-FUT.ATTR
   침
   chim
   worth
   읏저
   eus-jeo
   not.be-DEC
   볼 침 읏저
   bo-l chim eus-jeo
   see-FUT.ATTR worth not.be-DEC
   "hardly worth seeing"
Jeju has two suffixing plural markers, which are obligatory for plural nouns accompanied by determiners and optional otherwise. The plural marker -덜 -deol can occur with all nouns and pronouns. The marker -네 -ne is restricted for humans and pronouns, and can also have an associative meaning: e.g. 만수네 Mansu-ne "Mansu and his family" (lit. 'Mansu and his associates'). The combined sequence -네덜 -ne-deol is sometimes also used.
Nouns accompanied by numerals usually take a variety of classifiers, such as 재 jae for counting trees and 곡지 gokji for counting songs. Classifiers for cardinals are unmarked, but those for ordinals are followed by the ordinal-marking 체 che.

#### Noun particles

Jeju marks noun case and other semantic relations through suffixing noun particles. Particles that mark the nominative, accusative, and genitive cases are very frequently omitted. The table below is not exhaustive and lists only some of the most significant particles.
| Function | Particle | Allomorphy and variants | Example | Usage notes |
| Nominative | 이 -i | After vowel: 가 -ga | 할망이halmang-iᄀᆞᆯ안야?gawr-an-ya할망이 ᄀᆞᆯ안야?halmang-i gawr-an-ya"Did grandmother say that?" | Does not appear in the complement, unlike in Standard Korean. Cannot be topicalized. |
| Accusative | 을 -(eu)l | Rare, formal post-vowel form: 를 -reul | 시리레siri-reᄀᆞ를gawreu-l담으라.dam-eura시리레 ᄀᆞ를 담으라.siri-re gawreu-l dam-eura"Put the flour into the steamer." | Unlike in Korean, can be followed by other particles, e.g. 늘광 neu-l-gwang 2SG-ACC-COM "with you". |
| Genitive | 이/의 -i | — | 집이jib-i밧은bas-eun어듸eodui잇어?is-eo집이 밧은 어듸 잇어?jib-i bas-eun eodui is-eo"Where is your family's field?" | -i is rare, but required when the subsequent noun phrase begins with an adnominal clause. |
| Genitive | ㅅ -s | — | 산san읫ui-t낭nang산 읫 낭san ui-t nang"the trees on the mountain" | Called "pseudo-genitive" in Yang C., Yang S., and O'Grady 2019. Appears in certain compounds, as mentioned above. May also follow a locative marker to attribute a noun. |
| Dative | ᄀᆞ라 -gawra | — | 가의ᄀᆞ라gaui-gawra공븨ᄒᆞ렌gongbui-haw-renᄒᆞᆸ서.haw-b-seo가의ᄀᆞ라 공븨ᄒᆞ렌 ᄒᆞᆸ서.gaui-gawra gongbui-haw-ren haw-b-seo"Please tell him to study." | Restricted to human addressees of verbs of speaking. |
| Dative | 신디 -sindi | — | 그geu사름신디sareum-sindiᄀᆞᆯ읍디가?gawr-eup-di-ga그 사름신디 ᄀᆞᆯ읍디가?geu sareum-sindi gawr-eup-di-ga"Did you talk to that person?" | May be used with the verb 싯다 sitda "to exist" to form possessive constructions, with the dative marking the possessor. May also be suffixed with the allative particle -re to give further emphasis and a connotation of movement, or with the locative particle -seo to express an ablative meaning. |
| Dative | 안티 -anti | Due to interference from Korean cognate 한테 -hante: 한티 -hanti, 안테 -ante | 느안티neu-anti주마.ju-ma느안티 주마.neu-anti ju-ma"I will give [it] to you." | May be used with the verb 싯다 sitda "to exist" to form possessive constructions, with the dative marking the possessor. May also be suffixed with the allative particle -re to give further emphasis and a connotation of movement, or with the locative particle -seo to express an ablative meaning. |
| Dative | 아피 -api | — | 누게아피nuge-api줍디가?ju-p-di-ga누게아피 줍디가?nuge-api ju-p-di-ga"To whom did you give [it]?" | May be used with the verb 싯다 sitda "to exist" to form possessive constructions, with the dative marking the possessor. May also be suffixed with the allative particle -re to give further emphasis and a connotation of movement, or with the locative particle -seo to express an ablative meaning. |
| Topic-marking | 은 -(eu)n | Rarely, after vowel: 는 -neun | 오널은oneor-eun궹일날이우다.gwengilnal-i-u-da오널은 궹일날이우다.oneor-eun gwengilnal-i-u-da"Today is Sunday." | Either introduces a new topic or establishes a contrast. Must have a contrastive meaning sentence-internally. |
| Topic-marking | (이)랑 -(i)rang | — | 하르방이랑hareubang-irang저레jeo-re앚입서.aj-ib-seo하르방이랑 저레 앚입서.hareubang-irang jeo-re aj-ib-seo"Grandfather [and not anyone else], sit there." | Contrastive meaning only. |
| Topic-marking | (이)라근 -(i)rageun | Also used: (이)라근에 -(i)rageune | 느라근neu-rageun집이jib-i가라.ga-ra.느라근 집이 가라.neu-rageun jib-i ga-ra."You [and not anyone else], go home." | Contrastive meaning only. |
| Location-related | 이/의 -i | After -i and possibly -l: 에 -e Occasionally after any vowel: 예 -ye | 성seong바당의badang-i셔?sy-eo성 바당의 셔?seong badang-i sy-eo"Is my older sibling at the sea?" | Refers to location for stative verbs and direction for dynamic verbs; may also refer to time. According to Kim Jee-hong 2015, -(y)e is not an allomorph but a different locative morpheme used for clearly bounded spaces, such as tables or containers. |
| Location-related | (이)서/(의)서 -(i)seo | Post-vowel form -seo sometimes occurs after consonant. | ᄒᆞᆨ게서hawkge-seo공븨ᄒᆞ게.gongbui-haw-geᄒᆞᆨ게서 공븨ᄒᆞ게.hawkge-seo gongbui-haw-ge"Let's study at school." | Refers to location for action verbs. |
| Location-related | 디, 디서 -di, -diseo | — | 밧디bat-di밧디bat-di"In the field" | Variants of -i, -iseo used to emphasize the boundedness of the referent. Analyzed by Yang S., Yang C., and O'Grady 2019 not as a separate morpheme but as a bound noun meaning "place", juxtaposed with the locational noun. |
| Location-related | (드)레 -(deu)re | After liquid consonant -l and sometimes after vowel: 르레/러레 -leure/leore Initial syllable deu- also found as deo-, teu-, ti-, di-, de-, or ri- | 이착드레i-chak-deure비와불라.biw-a-bul-la이착드레 비와불라.i-chak-deure biw-a-bul-la"Pour [it] to this side." | Denotes direction of movement, like English "to; into; toward". Moon S. and Kim W. 2017 analyzes 레 -re and 드레 -deure as distinct particles, with -re having a solely directional meaning while -deure simultaneously emphasizes both the direction and the location of the direction's destination. Most sources treat the two as allomorphs, especially when appended to nouns. |
| Comitative and conjunctive | (이)영 -(i)yeong | — | 가읜gaui-n어멍이영eomeong-iyeongᄉᆞ답ᄒᆞ염ㅅ우게.sawdab-haw-yeoms-u-ge가읜 어멍이영 ᄉᆞ답ᄒᆞ염ㅅ우게.gaui-n eomeong-iyeong sawdab-haw-yeoms-u-ge"S/he is doing the laundry with his/her mom." | Kim Jee-hong 2015 notes: "These case markers only have differences of connotation, and may be interchangeably used without the least change in meaning." Like in Middle Korean but unlike in Modern Seoul Korean, comitative markers may occur on the final element being linked and also take other case markers. 책광chaek-gwangbook-COM가방광을gabang-gwang-eulbag-COM-ACC주다ju-dagive-SE책광 가방광을 주다chaek-gwang gabang-gwang-eul ju-dabook-COM bag-COM-ACC give-SE"Give books and bags" |
| Comitative and conjunctive | 왕/광 -(g)wang | — | 지슬광jiseul-gwangᄃᆞᆨ세기dawksegi지슬광 ᄃᆞᆨ세기jiseul-gwang dawksegi"potatoes and eggs" | Kim Jee-hong 2015 notes: "These case markers only have differences of connotation, and may be interchangeably used without the least change in meaning." Like in Middle Korean but unlike in Modern Seoul Korean, comitative markers may occur on the final element being linked and also take other case markers. 책광chaek-gwangbook-COM가방광을gabang-gwang-eulbag-COM-ACC주다ju-dagive-SE책광 가방광을 주다chaek-gwang gabang-gwang-eul ju-dabook-COM bag-COM-ACC give-SE"Give books and bags" |
| Comitative and conjunctive | ᄒᆞ곡 -hawgok | Also used: ᄒᆞ고 -hawgo | 낭ᄒᆞ고nang-hawgok고장gojangᄒᆞᄊᆞᆯhawsseul싱그라.singgeu-ra낭ᄒᆞ고 고장 ᄒᆞᄊᆞᆯ 싱그라.nang-hawgok gojang hawsseul singgeu-ra"Please plant some trees and flowers." | Kim Jee-hong 2015 notes: "These case markers only have differences of connotation, and may be interchangeably used without the least change in meaning." Like in Middle Korean but unlike in Modern Seoul Korean, comitative markers may occur on the final element being linked and also take other case markers. 책광chaek-gwangbook-COM가방광을gabang-gwang-eulbag-COM-ACC주다ju-dagive-SE책광 가방광을 주다chaek-gwang gabang-gwang-eul ju-dabook-COM bag-COM-ACC give-SE"Give books and bags" |

### Verbs

The Jeju verb consists of a root that is followed by suffixes that provide grammatical information such as voice, tense, aspect, mood, evidentiality, relative social status, and the formality of the utterance. Jeju verbs include not only action verbs familiar to English speakers such as 먹다 meokda "to eat" or 베리다 berida "to see", but also adjectival verbs such as 버치다 beochida "to be heavy" or 훍다 hultta "to be thick". Verbs can take derivational suffixes to form adverbs and nouns.
* ᄇᆞ디- bawdi- "to be close" → ᄇᆞ디게 bawdi-ge "closely"
* 궂- guj- "to be bad" → 궂임 guj-im "badness"
* 입- ib- "to wear" → 입기 ip-gi "wearing"
Especially for wh-questions and exclamations, Jeju speakers commonly use a verbal noun in place of a verb inflected for tense-aspect-mood.
   날도
   nal-do
   day-even
   영
   yeong
   like.this
   ᄃᆞᆺ임광!
   daws-im-gwang
   warm-NMLZ-COM
   날도 영 ᄃᆞᆺ임광!
   nal-do yeong daws-im-gwang
   day-even like.this warm-NMLZ-COM
   "What a warm day!" (lit. 'With the warmth of even the day like this!')
Verbs may also be given an attributive meaning through one of four adnominal suffixes.
* Adnominal suffix 은 -(eu)n: Past event for action verbs, achieved state for adjectival verbs
* Adnominal suffix 단 -dan: Habitual action in the past
* Adnominal suffix (으)는 -(eu)neun: Nonpast/present event or state, commonly habitual; cannot occur with other suffixes and must combine directly with the bare verb stem; can occur with adjectival verbs, unlike in Korean
* Adnominal suffix 을 -(eu)l: Future/conjectural event or state
   ᄐᆞᆮ을
   tawd-eul
   ᄉᆞᆼ키
   sawngki
   ᄐᆞᆮ을 ᄉᆞᆼ키
   tawd-eul sawngki
   "Vegetables that s/he will pluck"

#### Pre-final suffixes

Jeju has a number of pre-final verbal suffixes: tense-aspect-mood markers which follow the verb stem but cannot appear at the end of the inflected verb. The exact number of these suffixes is unclear because scholars disagree on the correct morphological segmentation. One analysis of the suffix paradigm, as presented in Yang C., Yang S., and O'Grady 2019, is given below.
There is relatively widespread agreement on the existence of the following four discrete TAM morphemes, presented in the order they co-occur: the continuative aspect marker 어ᇝ -eoms, the perfective aspect marker 엇 -eos, the prospective mood marker 읔 -(eu)k, and the realis mood marker (으)느 -(eu)neu. Depending on the analysis of the aforementioned epenthetical vowels that precede many verbal suffixes, the base forms of the three morphemes may alternately be analyzed as 엄시 -eomsi, 어시 -eosi, 크 -keu, and 느 -neu.
-eoms(i) is an imperfective or continuative aspect particle, referring to a process perceived as ongoing and similar to the English construction "be VERB-ing." With an adjectival verb, it has an inchoative ("beginning to; become") meaning. A verb with -eoms(i) is interpreted as either present or future by default, and some analyses interpret the particle as also conveying the present tense for specific events and states. The suffix has a vowel-harmonic variant -ams(i), as well as allomorphs -yeoms(i), -yams(i), and -ms(i) when following certain vowels.
Often characterized as a perfective aspect marker, -eos(i) has also been described as a present perfect marker and as behaving as a perfective marker with some verbs and as a past tense marker with others. -eos(i) can express non-past events in certain constructions that call for verbs "conceptualized in their entirety", such as a hypothetical future event. In adjectival verbs, it may also refer to a current state that contrasts with a past situation. -eos(i) can also be doubled for a habitual or a past perfect interpretation. Also like -eoms, this suffix takes the vowel-harmonic variant -as(i) and has allomorphs -yeos(i), -yas(i), and -s(i) after certain vowels.
The prospective mood marker 읔/으크 -(eu)k/(eu)keu marks the subject's intention in first-person-subject declarative sentences or second-person-subject interrogative sentences, and the speaker's conjecture otherwise. -(eu)k may also have a future-tense interpretation.
-(eu)k can only be followed by a small number of suffixes in Yang C., Yang S., and O'Grady 2019's analysis. Some analyses treat the initial vowel of the following suffix as part of an allomorph or nuanced variant of -(eu)k, so that 가커라 gakeora "[I] will go" may be segmented as ga-k-eora or ga-keo-ra.
The realis or indicative mood marker (으)느 -(eu)neu indicates "a fact or habitual action in the nonpast" which the speaker perceives to be true in general, permanently, or over a longer duration of time, as demonstrated in the contrast below. The putative non-past-tense marker -(eu)n may also be analyzed as an allomorph of -(eu)neu. In this context, the morpheme -(eu)n(eu) has also been interpreted as a perfect marker (not to be confused with the perfective marker).
The existence of the Korean subject-honorific marker (으)시 -(eu)si is controversial for Jeju, with some scholars arguing that it was entirely absent and others that it was restricted to higher registers. Ko J. 2011b notes that it was used only "by officials while referring to people of very high status and by the seonbi of the educated classes."

#### Segmenting verb-final suffixes

The segmentation of verb-final elements is controversial. The two recent extensive treatments of the topic, Yang C., Yang S., and O'Grady 2019 and Kim Jee-hong 2015, give incompatible analyses of the suffix paradigm.
Yang C., Yang S., and O'Grady 2019 includes a slot for tense in the Jeju verb, with three dedicated markers.
* Non-past tense: 은 -(eu)n
* Past tense: 언 -eon, with vowel-harmonic allomorph 안 -an
* Future tense: 을 -(eu)l
They further divide verb-final suffixes into three categories: Type 1, which cannot occur with tense markers; Type 2, which must occur with either a tense marker or the aspect marker -eoms, which loses its underlying -s before a Type 2 suffix; and a mixed type, which can occur with the non-past marker but not with the other two tense markers. The vast majority of suffixes are categorized as Tense 1 and thus cannot follow a tense marker. Uniquely among pre-final suffixes, the past tense marker -eon can also appear without a final suffix.
Examples of Yang C., Yang S., and O'Grady 2019's segmentation are given below.
   | Aspect + Type 1 sequence | Tense + Type 2 sequence |
   | 지슬jiseulpotatoᄆᆞᆫmawnall데꼇어라.dekky-eos-eora'"`UNIQ--ref-000001D$^5$-QINU`"'throw-PFV-SE지슬 ᄆᆞᆫ 데꼇어라.jiseul mawn dekky-eos-eorapotato all throw-PFV-SE"[I noticed that he/she] had thrown away all the potatoes." | 파치pachifallen.tangerines잘jalwell줏언게.jus-eon-ge'"`UNIQ--ref-000001D$^8$-QINU`"'pick-PST-SE파치 잘 줏언게.pachi jal jus-eon-gefallen.tangerines well pick-PST-SE"[I saw him/her] pick tangerines well." |
In Kim Jee-hong's analysis, verb-final single morphemes are termed "canonical endings". Canonical endings are contrasted with a wide variety of "non-canonical endings", formed by the fusion of various grammatical elements such as multiple canonical endings, truncated conjunctive and embedded sentences, and bound nouns connected to the verb stem or a canonical ending via an attributive or a nominalizer. The most common canonical component of these non-canonical endings is the suffix 어 -eo (vowel-harmonic allomorph 아 -a), which Kim calls the unmarked "default ending".
Since Yang C., Yang S., and O'Grady 2019's tenses align with the aforementioned attributive suffixes, sentences they analyze as "Tense-Type 2 Suffix" sequences are often analyzed as non-canonical endings with a "Canonical ending-Attributive-Bound noun" composition by Kim Jee-hong. Many of Yang C., Yang S., and O'Grady 2019's Type 1 suffixes are also interpreted as polymorphemic non-canonical endings. Kim Jee-hong also segments some of Yang C., Yang S., and O'Grady 2019's mixed-type suffixes so that the base form of the suffix includes the -n of the latter's non-past tense marker.
Examples from Kim Jee-hong 2015's analysis, directly corresponding to the examples above of Yang C., Yang S., and O'Grady 2019, are given below. The "default ender" -eo is bolded.

#### Sentence enders

Jeju has a number of clause-final suffixes, called "sentence enders" in Yang C., Yang S., and O'Grady 2019 and "terminal suffixes" (종결어미; jonggyeol eomi) in Korean, that provide information such as degree of formality, social status, evidentality, and modality. Sentence enders may consist of one or multiple morphemes. Kim Jee-hong argues for four speech levels in Jeju, defined by the degree of formality and deference their sentence enders connote: informal and plain (non-honorific); formal and plain; informal and honorific, marked by the morpheme 우 -u-, and formal and honorific, featuring the morpheme 읍 -eup. An archaic speech level showing extreme deference is attested from shamanic chants.
As different segmentation hypotheses produce different sentence enders. the chart below will list only a small, illustrative sample of the dozens of suffixes that appear in Yang C., Yang S., and O'Grady 2019 and Kim Jee-h. 2015. The classification is based on Kim Jee-hong 2017, which differs from Kim Jee-hong 2015.
Informal and plain :
| Morpheme | Morpheme | Example | Usage |
| 어/아 | -eo/a | 가이gai고와?gow-a가이 고와?gai gow-a"Is s/he pretty?" | Kim Jee-hong considers -eo the unmarked sentence ender. Depending on suprasegmentals, the suffix may be used in a plain statement, a question, a command, an exclamation, or a construction in which the speaker informs the addressee of information that the latter did not know and expects a confirmatory response. The suffix is also found in Standard Korean with a similar degree of versatility and widespread use. |
| (으)주 | -(eu)ju | 만수Mansu말mal잘jalᄀᆞᆮ주.gawd-ju만수 말 잘 ᄀᆞᆮ주.Mansu mal jal gawd-ju"Mansu talks well." | According to Kim Jee-hong, -ju conveys a statement of presumption or assumption without direct supporting experience, and invites the addressee to confirm the statement's veracity. Kim also states that -ju may end a confirmatory question with the implication that the addressee should agree with the speaker. According to Yang C., Yang S., and O'Grady, -ju expresses a statement of intention or strong assertion with a first-person subject and a statement of judgement or assumption with a third-person subject, and may also convey regret or advice. |
| (은)게 | (-eun)-ge | 날nal우쳣인게.uchy-eos-i(-)n-ge날 우쳣인게.nal uchy-eos-i(-)n-ge"[I see that] the day was cloudy." | (-eun)-ge generally conveys a statement of fact that the speaker has directly observed, or has inferred from a direct observation. In Yang C., Yang S., and O'Grady 2019, the suffix is given as -ge, a special Type 2 suffix which can only combine with the two tense markers ending in -n. Kim Jee-hong classifies it as a non-canonical ending composed of a fused attributive -eun and bound noun. |
| (으)멘 | (-eu)men | 느neu무시거musigeo시치멘?sichi-men느 무시거 시치멘?neu musigeo sichi-men"What are you washing?" | (-eu)men is used for both statements and questions, but only when the speaker and addressee are emotionally intimate. When the verb is inflected for aspect, (-eu)men is used to refer to a past event that was observed or inferred from observation. If uninflected, the suffix denotes an ongoing event. |
Formal and plain :
| Morpheme | Morpheme | Example | Usage |
| 다 | -da | 도새기dosaegi것geot먹엇다.meog-eot-da도새기 것 먹엇다.dosaegi geot meog-eot-da"The pig ate the fodder." | Unmarked formal statement ender. Dictionary citation form. |
| (으)저 | -(eu)jeo | 하르방hareubang몸momᄀᆞᆷ앗저.gawm-at-jeo하르방 몸 ᄀᆞᆷ앗저.hareubang mom gawm-at-jeo"Grandfather took a bath." | -jeo expresses a factual statement with the premise that the addressee is unaware of the fact, and may implicitly either urge the addressee to accept this new information or rebuke the addressee for not having known it. With a first-person subject, -jeo conveys the speaker's intention to do something. Whether these two uses of -jeo are connected uses of the same morpheme, or whether they are two different homophonous morphemes, is disputed. |
| 나 | -na | 이ithis풀pulplant사름덜이sareum-deor-iperson-PL-NOM먹나.meong-naeat-na이 풀 사름덜이 먹나.i pul sareum-deor-i meong-nathis plant person-PL-NOM eat-na"This plant is edible." | Expresses a statement of fact with the implication that it is an intrinsic or permanent quality or state; commonly found with proverbs and aphorisms. -na is also used to ask questions about facts (including non-permanent facts), where it has a "somewhat authoritative tone". As with -jeo, whether these two uses reflect the same morpheme or two homophonous ones is disputed. |
| 고나 | -gona | 이디i-di물mul새라낫고나!saer-a-na-t-gona이디 물 새라낫고나!i-di mul saer-a-na-t-gona"The water had leaked here!" | Expresses a statement of surprise or excitement. Yang C., Yang S., and O'Grady 2019 gives the suffix as 구나 -guna instead. Kim Jee-hong reports that the suffix can be shortened to a single syllable 고 -go. |
| 가 은가 | -ga (-eu)n-ga | 그듸geu-di무사musaᄃᆞᆺ앗인가?daws-as-i(-)n-ga그듸 무사 ᄃᆞᆺ앗인가?geu-di musa daws-as-i(-)n-ga"Why is that place warm?" | Conveys a question directed to the addressee. Yang C., Yang S., and O'Grady 2019 analyzes the suffixes as Type 2 ender -ga, with -n-ga not a genuine ending but -ga following a tense marker ending in -n. Kim Jee-hong distinguishes the canonical ending -ga with the non-canonical -eun-ga, which is analyzed as having a fused attributive. |
| 은고 | (-eu)n-go | 선싕seonsing무시거musigeo테왓인고?tew-as-i(-)n-go선싕 무시거 테왓인고?seonsing musigeo tew-as-i(-)n-go"I wonder what the teacher distributed." | Has a conjectural connotation. Often used in questions addressed to oneself, and is less direct than -eun-ga when asked to the addressee. Yang C., Yang S., and O'Grady 2019 analyzes the suffix as mixed type ender -go, with -eun-go being -go preceded by the non-past tense marker (and gaining this conjectural meaning only in the presence of the non-past tense marker). Kim Jee-hong analyzes it as a non-canonical ending with a fused attributive. |
| 디아 | -dia | 는neu-n무사musa얼언디아?eor-eo(-)n-dia는 무사 얼언디아?neu-n musa eor-eo(-)n-dia"Why are you cold?" | Used to ask a question about which the addressee has direct relevant experience. In most cases the addressee is the subject of the verb, although third-person subjects have been attested. Appears in Kim Jee-hong's work in the contracted form 댜 -dya. |
| (으)게 | -(eu)ge | 먹엇이게!meog-eos-i(-)ge먹엇이게!meog-eos-i(-)ge"Let's get finished eating!" | Used in propositions (not commands as in Standard Korean). |
| (으)라 | -(eu)ra | 먹으라!meog-eura먹으라!meog-eura"Eat!" | Used to command immediate action. |
| (으)심 (으)순 | -(eu)sim -(eu)sun | ᄌᆞ미나게jawmi-na-ge놀순!nol-sunᄌᆞ미나게 놀순!jawmi-na-ge nol-sun"Have fun!" | Used by older women when talking to younger adults not old enough for honorifics and not young or emotionally close enough for informal speech. May convey statements, questions, requests, and proposals. |
The honorific verbs, which show deference to the addressee, are formed by a special suffix that can be followed only by a small number of sentence enders.
The informal honorific forms are marked by 우 -u- or (으)우 -(eu)u-. The former is used with the copula verb 이다 ida and with all inflected verbs, and the latter is used with uninflected adjectival verbs. -u- and -(eu)u- may take the alternative form 수 -su- after a verb inflected for aspect and a non-liquid consonant, respectively. The informal honorific form cannot occur with uninflected action verbs. The two suffixes may only be followed by the sentence enders in the table below. Informal honorific requests cannot be formed morphologically.
| Honorific | Sentence ender | Example | Usage |
| (으)우 -(eu)u- | 다 -da | 물mul질엇우다.jil-eos-u-da물 질엇우다.mul jil-eos-u-da"S/he drew water." | Used for statements. |
| (으)우 -(eu)u- | 게 -ge 궤 -gwe | ᄎᆞᆯ레chawlle멩글앗우게.menggeul-as-u-geᄎᆞᆯ레 멩글앗우게.chawlle menggeul-as-u-ge"I have made side dishes." | Used to report new information; restricted to inflected verbs. |
| (으)우 -(eu)u- | 꿰 -kkwe | 짚우우꿰.jip-uu-kkwe짚우우꿰.jip-uu-kkwe"It is deep." | Used to report new information or an opinion; restricted to uninflected verbs. |
| (으)우 -(eu)u- | 가/강 -ga(ng) 과/광 -gwa(ng) 꽈/꽝 -kkwa(ng) | ᄃᆞᆨ세기dawk-segi데끼쿠과?dekki-k-u-gwaᄃᆞᆨ세기 데끼쿠과?dawk-segi dekki-k-u-gwa"Will you throw away the eggs?" | Used in questions. -gwa(ng) is generally restricted to inflected verbs. Due to sound symbolism, the tense endings are considered emphatic. |
The formal honorific forms involve the honorific marker 읍 -(eu)p- followed by one or two morphemes. Only the six following formal honorific forms are possible.
| Honorific | Evidential | Sentence ender | Example | Usage |
| 읍 -(eu)p- | 네/니 -ne/ni | 다 -da | 그geu신sin만수신디Mansu-sindi족읍네다.jog-eup-ne-da그 신 만수신디 족읍네다.geu sin Mansu-sindi jog-eup-ne-da"[I know] those shoes must be small for Mansu." | A formal statement founded on prior knowledge, e.g. of Mansu's foot size. Implies that the rationale for the statement continues in the present and may be shared or experienced by the addressee. |
| 읍 -(eu)p- | 네/니 -ne/ni | 까/깡 -kka(ng) | 나가na-gaᄆᆞᆫ처mawncheo앚입네까?aj-ip-ne-kka나가 ᄆᆞᆫ처 앚입네까?na-ga mawncheo aj-ip-ne-kka"Should I sit first?" | A formal question that the addressee is expected to be able to answer without direct observation. |
| 읍 -(eu)p- | 데/디 -de/di | 다 -da | 그geu신sin만수신디Mansu-sindi족읍데다.jog-eup-de-da그 신 만수신디 족읍데다.geu sin Mansu-sindi jog-eup-de-da"[I saw] those shoes were small for Mansu." | A formal statement motivated by a direct, external past observation that cannot be experienced firsthand by the addressee. As the observation must be external, the first-person singular subject is prohibited except in highly atypical situations such as dissociation. |
| 읍 -(eu)p- | 데/디 -de/di | 가/강 -ga(ng) | 날이nal-i얼큽디가?eol-k(-)eu(-)p-di-ga날이 얼큽디가?nal-i eol-k(-)eu(-)p-di-ga"[Based on your observation,] will the day be cold?" | A formal question that the addressee is expected to answer based on a past observation relating to a third party. |
| 읍 -(eu)p- | — | 서 -seo | 이거i-geo먹읍서.meog-eup-seo이거 먹읍서.i-geo meog-eup-seo"Please eat this." | A formal request. |
| 읍 -(eu)p- | — | 주 -ju | 지슬jiseul줏입주.jus-ip-ju지슬 줏입주.jiseul jus-ip-ju"Let's gather the potatoes." | Expresses speaker's intention with a first-person subject and advice or judgment otherwise; widely used for suggestions and propositions. |

#### Connectives

Jeju uses an array of verb-final connective suffixes to link clauses within sentences, much as English does with conjunctions such as and, or, that, but, and because.
Some Jeju connectives, such as the suffixes 언/엉 -eon/eong "and", occur in pairs with one variant ending in -n and the other in -ng. Hong Chong-rim and Song Sang-jo both note that the choice between -n and -ng is often determined by the inflections of the subsequent clause; certain pre-final suffixes and sentence enders require a n-connective in the previous clause, while others require a ng-connective. Hong suggests that -n is used for specific and objective events and states, while -ng implies a general and subjective event or state. Song argues that -n is used for completed or achieved verbs, and -ng for incomplete or unachieved verbs. The nuances below are thus possible.
The distinction between -n and -ng does not exist in mainland Korean varieties. Yang C., Yang S., and O'Grady 2019 reports that "the contrast between -eong and -eon appears to be disappearing, and the distinctions that remain are subtle and variable."
An important class of connectives, used for reporting speech and thoughts, is formed by the suffix 엔/엥 -en/-eng, which fuses with sentence enders as in the example of -da below.
Similarly, informal honorific conjectural k-u-da becomes 켄 -ken; plain forms -ju and -jeo become 젠 -jen; question enders -ga and -go become 겐 -gen and 곤 -gon; honorific imperative -eup-seo becomes 읍센 -eup-sen; and so forth. These fused suffixes may be used for both quotative and reportive purposes. In Standard Korean, indirect speech is strictly distinguished from the quotative by the removal of addressee honorifics and the switching of pronouns. In Jeju, the lines between direct and indirect speech are more blurred. All four forms below—given in order of increasing indirectness—are in use, and have the same meaning, "He said [to a superior] that he was going home."
   "난
   na-n
   1SG-TOP
   집이
   jib-i
   house-LOC
   가ᇝ우다"엔
   ga-ms-u-da-en
   go-CONT-HON-SE-QUOT
   ᄀᆞᆯ앗수다.
   gawr-at-su-da
   say-PFV-HON-SE
   [direct quote]
   "난 집이 가ᇝ우다"엔 ᄀᆞᆯ앗수다.
   na-n jib-i ga-ms-u-da-en gawr-at-su-da
   1SG-TOP house-LOC go-CONT-HON-SE-QUOT say-PFV-HON-SE
   난
   na-n
   1SG-TOP
   집이
   jib-i
   house-LOC
   가ᇝ우덴
   ga-ms-u-den
   go-CONT-HON-REP
   ᄀᆞᆯ앗수다.
   gawr-at-su-da
   say-PFV-HON-SE
   [quotative fused]
   난 집이 가ᇝ우덴 ᄀᆞᆯ앗수다.
   na-n jib-i ga-ms-u-den gawr-at-su-da
   1SG-TOP house-LOC go-CONT-HON-REP say-PFV-HON-SE
   진
   ji-n
   3SG-TOP
   집이
   jib-i
   house-LOC
   가ᇝ우덴
   ga-ms-u-den
   go-CONT-HON-REP
   ᄀᆞᆯ앗수다.
   gawr-at-su-da
   say-PFV-HON-SE
   [pronouns changed]
   진 집이 가ᇝ우덴 ᄀᆞᆯ앗수다.
   ji-n jib-i ga-ms-u-den gawr-at-su-da
   3SG-TOP house-LOC go-CONT-HON-REP say-PFV-HON-SE
   진
   ji-n
   3SG-TOP
   집이
   jib-i
   house-LOC
   가ᇝ덴
   ga-ms-den
   go-CONT-REP
   ᄀᆞᆯ앗수다.
   gawr-at-su-da
   say-PFV-HON-SE
   [honorific neutralized]
   진 집이 가ᇝ덴 ᄀᆞᆯ앗수다.
   ji-n jib-i ga-ms-den gawr-at-su-da
   3SG-TOP house-LOC go-CONT-REP say-PFV-HON-SE
Other connectives include (으)민 -(eu)min "if"; (으)난 -(eu)nan "because"; and 단/당 -dan/dang "after".

#### Auxiliary and light verbs

Jeju has many auxiliary verbs that are linked to the preceding main verb by the morpheme 어/아 -eo/a. These include 안네다 anneda "to give", for an action that benefits a superior; 불다 bulda "to throw away", for an action yielding a complete result; and 지다 jida "to become", for a change of state. Jida is also used to indicate ability.
   일
   il
   work
   하영
   hayeong
   a.lot
   헤노난
   he-nonan
   do-because
   죽어지켜.
   jug-eo-ji-k-yeo
   die-eo-become-PROSP-SE
   일 하영 헤노난 죽어지켜.
   il hayeong he-nonan jug-eo-ji-k-yeo
   work a.lot do-because die-eo-become-PROSP-SE
   "I will become close to dying because I work a lot."
Jeju also uses light verbs, which have little semantic meaning but combine with nouns to form verbs. The most common light verb is ᄒᆞ다 hawda "to do", e.g. 부름씨 bureumssi "errand" → 부름씨ᄒᆞ다 bureumssi-hawda "to run an errand". There is also a large inventory of periphrastic phrases that convey modality.

### Post-phrasal particles

Jeju has a small group of particles that commonly occur at the very end of phrases or sentences, many of which play important roles as discourse markers. The four principal ones are the formality marker 마씀 -masseum and the emphatic markers 게 -ge, 이 -i, and 양 -yang.
-masseum (variants 마씸 -massim, 마씨 -massi) may occur after subsentential phrases such as a bare or case-inflected noun, or attach to a small number of mostly plain sentence enders. The particle shows the speaker's deference towards the addressee, but is considered more emotionally intimate than the verbally inflected honorifics. In certain contexts, -masseum may be used with an intention to snub the addressee.
-ge is a discourse marker that attaches to adverbs, nouns and noun particles, and both sentence enders and connectives. It adds emphasis to the utterance and is often used to agree with or confirm something the addressee has just said. -i is used similarly to -ge, but is weaker in its emphasis. Both cannot be used while addressing a social superior, and -i also cannot appear in formal speech. Both particles can also appear in isolation: ge as a strong affirmation to a question, i as an indication that the speaker has not heard or does not believe what has been said.
-yang shows deference, but is considered more informal than -masseum. At the end of a sentence, it emphasizes the speaker's beliefs or attitudes. For example, a question becomes a rhetorical one when -yang is attached: 이시카 is-ik-a "Could there be?" → 이시카양 is-ik-a-yang "How could there be?" The particle is also commonly used for sarcastic mock deference, such as by parents while scolding children. Sentence-initially or internally, the suffix may establish the preceding element as the topic of discourse. Yang is also used in isolation as an interjection to get the attention of unfamiliar individuals, such as a shopkeeper, or to request the addressee to repeat what they have just said.
In the example below from Yang C. 2009, three of the four particles discussed above are used.
   | Granddaughter: | 할마니,halmani,이디가idi-ga말로만mal-loman들어난deureo-nan모슬포우꽈?Moseulpo-ukkwa?할마니, 이디가 말로만 들어난 모슬포우꽈?halmani, idi-ga mal-loman deureo-nan Moseulpo-ukkwa?"Grandmother, is this place Moseulpo, which I've only heard of?" |
   | Grandmother: | ᄋᆞaw맞다게,matda-ge,이디가idi-ga모슬포여.Moseulpo-yeo.ᄋᆞ 맞다게, 이디가 모슬포여.aw matda-ge, idi-ga Moseulpo-yeo."Yes, you're indeed correct, this place is Moseulpo." |
   | Granddaughter: | 모슬포양...Moseulpo-yang...게민gemin어떵허연eotteong-heoyeon모슬포옌Moseulpo-yenᄒᆞ엿인신고마씸?hawyeosinsingo-massim?ᄒᆞᆨ교에서hawkgyo-eseo숙제sukje내연마씸.naeyeon-massim.모슬포양... 게민 어떵허연 모슬포옌 ᄒᆞ엿인신고마씸? ᄒᆞᆨ교에서 숙제 내연마씸.Moseulpo-yang... gemin eotteong-heoyeon Moseulpo-yen hawyeosinsingo-massim? hawkgyo-eseo sukje naeyeon-massim."Moseulpo, right... So why do they call it Moseulpo, please? They gave us an assignment at school, please." |
Note the granddaughter's use of the verbally inflected honorific -u- and the deference-marking massim and yang while addressing the grandmother.

### Pronouns and deixis

Jeju has the following basic personal pronouns.
| | Singular | Plural | Usage |
| 1st person | 나/내 na/nae "I; me" | 우리(덜) uri(-deol) "we; us" | |
| 2nd person | 느/니 neu/ni "you (s.)" | 느네(덜) neu-ne-(deol) "you (pl.)" | For younger, emotionally intimate, or socially inferior individuals |
| 2nd person | 지 ji "you (s.)" | 지네(덜) ji-ne(-deol) "you (pl.)" | For younger individuals, but more respectful than neu/ni |
| 2nd person | No overt pronoun | No overt pronoun | For older individuals |
| 3rd person | None per se. Informally, demonstratives used before 아의 ai: 가이 gai "him/her" (lit. 'that person'), etc. | None per se. Informally, demonstratives used before 아의 ai: 가이 gai "him/her" (lit. 'that person'), etc. | None per se. Informally, demonstratives used before 아의 ai: 가이 gai "him/her" (lit. 'that person'), etc. |
According to Yang C., Yang S., and O'Grady 2019, there are four basic deictic demonstratives in Jeju. Most other sources mention three, which are identical to those of Standard Korean.
* Proximal: 이 i "this"
* Medial or absent: 그 geu "that"
* Distal: 저 jeo "that"

## Vocabulary

Most of the Jeju lexicon is Koreanic, and "a sizeable number" of words are identical with Korean. There are false friends between the languages, such as Korean 감다 gamda "to wash hair" and Jeju ᄀᆞᆷ다 gawmda "to wash the body". Jeju also preserves many Middle Korean terms now lost in Korean, such as 갓 gat "wife; woman" and 어시 eosi "parent". Like Korean, Jeju uses many Sino-Korean words based on local readings of Classical Chinese.
Jeju Island was ruled by the Mongols in the late thirteenth century and some Middle Mongol terms still survive in the language, though the extent of Mongol influence is disputed. Popular claims of hundreds of Mongol loans in Jeju are linguistically unsound. Uncontroversial Mongol loans are most common in terms relating to animal husbandry.
| English | Jeju | Middle Mongol |
| bridle | 가달 gadal | qada'ar |
| halter | 녹대 nokdae | noγta |
| two-year-old cattle | 다간 dagan | daγaγan "two-year-old horse" |
| classifier for houses | 거리 geori | ger "house" |
Jeju may have loans from an ancient Japonic substratum. As the last fluent generation of Jeju speakers were born under or shortly after Japanese rule, remaining speakers also use many loans from Modern Japanese.
| English | Jeju | Japanese |
| noisy | 우르사이 ureusai | うるさい urusai |
| chopsticks | 하시 hasi | 箸 hashi |
| habit | 쿠세 kuse | 癖 kuse |

### Sound symbolism

Jeju has widespread sound symbolism in ideophones. The use of sound symbolism to form emphatic variants of words is more common in Jeju than in Seoul Korean.
Jeju sound symbolism operates with both consonants and vowels. The intensity of a Jeju word may be strengthened by using tense and especially aspirate obstruents. The sound symbolism may also be emphasized through the addition of consonants, by adding the sequence -락 -rak to both reduplicated segments, and with fortition or lenition. The yang harmonic class of vowels has a bright, small connotation, and the yin vowel class gives a dark, large connotation. Ko Jae-hwan also gives examples of three or four layers of vowel sound symbolism.
* Consonant sound symbolism:
** 고시롱 gosirong "savory" → 꼬시롱 kkosirong "[very] savory" → 코시롱 kosirong "[extremely] savory"
** 을강을강 eulgang-eulgang "[small] sound of rat gnawing teeth" → 글강글강 geulgang-geulgang "[large] sound of rat gnawing teeth"
** ᄇᆞᆯ착ᄇᆞᆯ착 bawlchak-bawlchak "easily angered" → ᄇᆞᆯ치락ᄇᆞᆯ치락 bawlchirak-bawlchirak "[very] easily angered"
** 크뜽크뜽 keutteung-keutteung "neatly aligned" → 코찡코찡 kojjing-kojjing "[very] neatly aligned"
* Vowel sound symbolism:
** 동골동골 donggol-donggol "round [of a small object]" → 둥굴둥굴 dunggul-dunggul "round [of a large object]"
** ᄋᆞᆼ당ᄋᆞᆼ당 awngdang-awngdang "[small and light] sound of muttered complaints" → 옹당옹당 ongdang-ongdang "[large and heavy] sound of muttered complaints" → 웅당웅당 ungdang-ungdang "[very large and very heavy] sound of muttered complaints"
** ᄆᆞᆫ들ᄆᆞᆫ들 mawndeul-mawndeul "smooth to the touch [of a very small or dry object]" → 맨들맨들 maendeul-maendeul "smooth to the touch [of a somewhat small or dry object]" → 문들문들 mundeul-mundeul "slippery to the touch [of a somewhat large or wet object]" → 민들민들 mindeul-mindeul "slippery to the touch [of a very large or wet object]"
Multiple sound-symbolic strategies may combine in a single word. Kang S. 2008 gives eight sound symbolic variants of the ideophone ᄆᆞᆯ탁ᄆᆞᆯ탁 mawltak-mawltak "the shape of many objects being blunt", each more intense than the other:
   ᄆᆞᆯ탁ᄆᆞᆯ탁 mawltak-mawltak → ᄆᆞᆯ트락ᄆᆞᆯ트락 mawlteurak-mawlteurak → ᄆᆞᆯ착ᄆᆞᆯ착 mawlchak-mawlchak → ᄆᆞᆯ치락ᄆᆞᆯ치락 mawlchirak-mawlchirak → 뫁탁몰탁 moltak-moltak → 몰착몰착 molchak-molchak → 몰트락몰트락 molteurak-molteurak → 몰치락몰치락 molchirak-molchirak

### Kinship terminology

The kinship terminology of Jeju has been the focus of particular attention. Jeju has a complex kinship system that distinguishes the gender of both the speaker and the relative. Gender distinctions are particularly noticeable in sibling terminology. The words 성 seong and 아시 asi refer to "older same-gender sibling" and "younger same-gender sibling" respectively, while 오라방 orabang and 누이 nui refer specifically to "brother of a female" and "sister of a male" respectively. Female speakers also tend to refer to relatives with native compounds, whereas male speakers prefer Sino-Korean terms. For instance, the same cousin may be referred to by a man as ᄉᆞ춘 sawchun "cousin" but by a woman as 고모님 ᄄᆞᆯ gomo-nim ttawl "paternal aunt's daughter." A major distinction between Jeju and Korean kinship terms is that women do not use honorifics to refer to their in-laws, reflecting weaker historical influence from Confucian patriarchal norms.
Jeju also uses supplementary prefixes to clarify the type of kinship, equivalent to "step-" or "maternal" in English. These include 친- chin-, 성- seong-, and 당- dang- for paternal relations, 웨- we- for maternal relations, 다슴- daseum- for step-relations, 처- cheo- and 가시- gasi- for a male's in-laws, and 시- si- for a woman's in-laws. Five other prefixes, which may be combined, mark relative age: 쳇- chet- or 큰- keun- "eldest", 셋- set- "second eldest of three or more", 말젯- maljet- "third eldest of four or more", and 족은- jogeun- "youngest". These are used to distinguish relatives of the same generation.
* 하르방 hareubang "grandfather"
** 큰하르방 keun-hareubang "oldest brother of one's grandfather"
** 셋하르방 set-hareubang "second brother of one's grandfather"
** 큰말젯하르방 keun-maljet-hareubang "third brother of one's grandfather"
** 셋말젯하르방 set-maljet-hareubang "fourth brother of one's grandfather"
** 족은말젯하르방 jogeun-maljet-hareubang "fifth brother of one's grandfather"
** 족은하르방 jogeun-hareubang "youngest brother of one's grandfather"
Other prefixes include 왕- wang-, used in 왕하르방 wang-hareubang "great-grandfather", and 넛- neot-, used to refer to a sibling of one's grandparent generally.

## Sample text

The following is an excerpt from a version of the Menggam bon-puri, one of the epic chants recited by Jeju shamans. In this myth, the poacher Song Saman discovers an abandoned skull in the hills and cares for it as if it were his own ancestor. The skull reciprocates by warning Song Saman of his early death and advising him on how to avoid the chasa, the three gods of death.
This version was transcribed between 1956 and 1963 from the recitation of the shaman Byeon Sin-saeng, born c. 1904. The transcription predates both standardized orthographies of Jeju. The transcriber openly notes that the orthography is inconsistent. No attempt was made in this article to standardize or update the orthography.
| Jeju original | Korean translation |
| "느 송ᄉᆞ만이 전맹이 ᄀᆞᆺ 서른이 매기난, 서른 나는 해에 아무ᄃᆞᆯ 아무날은 맹이 매기니 느가 발 살앙 오몽ᄒᆞ여질 때, 나를 낭곳으로 ᄀᆞ져다 도라... 시 ᄆᆞ슬 강 심방 시 개 걷우우곡 마당이 큰대 세왕 두 일회 열나을 굿을 ᄒᆞ라..."맷딱 ᄎᆞᆯ려놓완 백보 밲겼딜로 간 절을 ᄒᆞ연, ᄀᆞ만이 꿀련 업더져두서 보난 삼체ᄉᆞ가 ᄂᆞ려오멍..."송ᄉᆞ만이네 집이서 정성을 아니드렴신가?"말자이 오는 체ᄉᆞᆫ "송ᄉᆞ만이네 집이 백년대강이를 모삼따. 그 백년대강이가 송ᄉᆞ만이 심으레 오람센 ᄀᆞᆯ아분 생이여... 받음은 받았주마는 심엉 오랜 ᄒᆞᆫ 시간이 시여부난 어떵흘코?" | "너 송사만이는 겨우 서른이 수명의 끝이니, 서른 되는 해에는 아무 달 아무 날에 명이 끝날 테이므로 너가 발이 살아서 움직일 수 있을 때 나를 나무숲으로 데려다 달라... 마을 세 곳에 가서 무당 세 명을 모으고 마당에 큰 깃대 세워서 두 이레 열나흘 굿[제주 큰굿]을 하라..."다 차려놓은 체 백보 바깥으로 가 절하며 가만히 무릎 꿇고 업드리고 보니까, 삼차사가 내려오면서..."송사만이네 집에서 정성을 드리고 있는 것 아닌가?"나중에 오는 차사는, "송사만이네 집에서 백년 된 해골을 모시고 있다. 그 백년 된 해골이 송사만이 잡으러 오고 있다고 말해버린 모양이야... 준 건 받았지만 잡아 오라고 한 마감이 있는데 어떻게 할까?" |
| Romanization ||
| neu Song Sawman-i jeonmaeng-i gawt seoreun-i maeg-inan, seoreun naneun hae-e amu dawl amu nar-eun maeng-i maeg-ini neu-ga bal sarang omong-hawyeo-jil ttae, na-reul nang-gos-euro gawjyeoda dora... si mawseul gang simbang si gae geoduugok madang-i keun dae sewang du ilhwe yeol-naeul gus-eul hawra... maetttak chawllyeo-nowan baekbo baekgyeot-dillo gan jeor-eul hawyeon, gawmani kkulyeon eopdeojyeo-duseo bonan samchesaw-ga nawryeo-omeong... "Song Sawman-i-ne jib-iseo jeongseong-eul ani deuryeomsin'ga?" Maljai oneun chesaw-n "Song Sawman-i-ne jib-i baengnyeon-daegang'i-reul mosamtta. geu baengnyeon-daegang'i-ga Song Sawman-i simeure oramsen gawra-bun saeng-iyeo... badeum-eun badat-jumaneun simeong oraen hawn sigan-i siyeo-bunan eotteong-heulko?" ||
| English ||
| "You, Song Saman, your life will end at only thirty, and the year you turn thirty, your life will end at any day of any month, so take me to the wooded forest while your feet are still alive and you can move... Go to three villages and gather three shamans and raise a great flagstaff in the household hall, and hold the Great Gut [lit. 'the gut of two weeks and fourteen days']..." Once they laid out everything, [Song Sawman and his wife] went back a hundred steps and prostrated themselves. Quietly kneeling and lying prone, they saw the three chasa descend... "Are they not doing devotional acts at Song Saman's household?" The chasa coming in last [responded], "At Song Saman's household, they are worshipping a hundred-year-old skull. It seems that the hundred-year-old skull told [them] that we were coming to capture Song Sawman... We have partaken of the offerings [lit. 'received what is received'], but there is a date that they told us to capture him by, so what should we do?" ||