# Vietnamese grammar

Vietnamese is an analytic language, meaning it conveys grammatical information primarily through combinations of words as opposed to suffixes. The basic word order is subject-verb-object (SVO), but utterances may be restructured so as to be topic-prominent. Vietnamese also has verb serialization. In sentences, the head of the phrase usually precedes its complements (i.e. head-initial), nouns are classified according to series of lexical parameters (noun classifier system), and pronouns may be absent from utterances (pro-drop, sometimes without copula verbs). Question words in the language do not exhibit wh-movement.

## Word classes

Vietnamese lexical categories (or "parts of speech") consist of:
* nouns
* demonstrative noun modifiers
* articles
* classifiers
* numerals
* quantifiers
* the focus marker particle
* verbs
* adjectives
* adverbial particles
* prepositions
The syntax of each lexical category and its associated phrase (i.e., the syntactic constituents below the sentence level) is detailed below. Attention is paid to both form and function.

## Morphosyntax
### Nouns and noun phrases

Nouns can be distinguished from verbs syntactically in that the copula là "to be" may precede nouns in predications, whereas the copula fails to occur before verbs or adjectives.
    Mai là sinh viên.
    "Mai is (a) student."
For the meaning of the sentence to be understandable, in the sentence above the copula là precedes sinh viên "student". Omitting the copula, as in *Mai sinh viên results in an ungrammatical sentence. In contrast, verbs/adjectives do not co-occur with the copula.
    Mai cao.
    "Mai is tall."
The adjective cao (as in the sentence above) does not require a preceding copula, and thus the sentence *Mai là cao is ill-formed.
The noun category can be further subdivided into different noun classes according to semantic and syntactic criteria. Some of the subclasses identified in Nguyễn (1997) include:
* proper noun
* common noun
** item noun
** collective noun
** unit (or measure) noun
** mass noun
** time noun
** abstract noun
* classifier
* locative
Nouns can be modified with other words resulting in complex noun phrases. These modifiers include demonstratives, quantifiers, classifiers, prepositional phrases, and other attributive lexical words, such as other nouns and verbs. These modifiers co-occur with the modified noun (known as the head noun or noun phrase head), but there are restrictions on what kind of modifiers are allowed depending upon the subclass of noun. The noun phrase has the following structure:
| TOTALITY | + | ARTICLE | + | QUANTIFIER | + | CLASSIFIER | + | HEAD NOUN | + | ATTRIBUTIVE MODIFIER(S) | + | DEMONSTRATIVE | + | PREPOSITIONAL PHRASE (possessive) |
Example:
cả
all
TOTALITY
hai
two
QUANTIFIER
cuốn
CLF$_{book}$
CLASSIFIER
từ điển
dictionary
HEAD NOUN
Việt Anh
Vietnamese-English
ATTRIBUTIVE NOUN PHRASE
này
PROX.DEM
DEMONSTRATIVE
của [nó]
of [3.PN]
PREP PHRASE
cả hai cuốn {từ điển} {Việt Anh} này {của [nó]}
all two CLF$_{book}$ dictionary Vietnamese-English PROX.DEM {of [3.PN]}
TOTALITY QUANTIFIER CLASSIFIER HEAD NOUN ATTRIBUTIVE NOUN PHRASE DEMONSTRATIVE PREP PHRASE
"both of these Vietnamese-English dictionaries of his"

#### Article position

Following Nguyễn Hùng Tưởng (2004) and Nguyễn T. C. (1975), Vietnamese has an article lexical category slot that occurs before a quantifier.
những
PL
ý nghĩ
idea
những {ý nghĩ}
PL idea
"(the) ideas"
các
PL
quả
CLF
cam
orange
các quả cam
PL CLF orange
"(the) oranges"

#### Quantifiers

Quantifiers (also known as numerators) modify the adjacent noun by expressing their quantity. In Vietnamese they occur within a noun phrase before a head noun (with or without a classifier). Quantifiers include cardinal numerals, and other words which indicate some quantity. (Cardinal numerals are described in the numeral section.) Examples of quantifiers:
    QuantifierEnglish gloss một, hai, ba, bốn, etc.cardinal numerals vài, vài bafew dăm, dăm bảyseveral, few mọievery mỗieach từngeach in turn mấyfew, how much/how many bao nhiêuhow much/how many bây nhiêu/bấy nhiêu"this much/this many
Quantifiers directly precede the head noun that they modify when the head occurs without a classifier:
When a classifier co-occurs with a following head noun, the quantifier precedes the classifier:
As in English, mass nouns such as thịt "meat", đất "soil", and collective nouns such as trâu bò "cattle", ruộng nương "(rice) fields" usually occur without quantifiers in Vietnamese. However, these nouns can be specified by words denoting measurement units such as cân "kilogram", lạng "tael", nắm "handful", chén "cupful":

#### Focus marker position

The optional particle cái is identified as a focus marker by Nguyễn Hùng Tưởng (2004). It has been called by several other names, including general classifier, general categorical, ''extra" cái, "extra" general classifier, definite article, superarticle, definite word, demonstrative word, and chỉ xuất "indexical". Focus cái occurs directly before classifiers or unit nouns and may be preceded by other pre-noun modifiers such as quantifiers, numerals, and articles. It always co-occurs with a classifier.
As can be seen by descriptions of focus cái as "general classifier", etc., this particle has often been analyzed as a classifier. However, it can be distinguished by its different behavior. Focus cái always precedes a following classifier and may not directly precede the head noun. The noun phrase
cái
FOC
con
CLF
chó
dog
này
DEM.PROX
cái con chó này
FOC CLF dog DEM.PROX
"this very dog"
is grammatical, but the phrase
con
CLF
cái
FOC
chó
dog
này
DEM.PROX
* con cái chó này
 CLF FOC dog DEM.PROX
"this very dog"
is not grammatical. More than one classifier is not allowed within the same noun phrase, whereas focus cái does occur along with a following classifier (as can be seen above). Examples of other modifiers preceding the focus marker are below:
Again, cái must follow the other pre-noun modifiers, so phrases where cái precedes a numeral or article (such as *cái hai chó đen này or *cái các con mèo này) are ungrammatical.
The focus marker cái is distinct from the classifier cái that classifies inanimate nouns (although it is historically related to the classifier cái). Thus, classifier cái cannot modify the noun chó "dog" (in cái chó) since chó is animate (the non-human animate classifier con must be used: con chó), whereas focus cái can modify nouns of any animacy (with their appropriate classifier):
cái
FOC
cuốn
CLF
sách
book
này
DEM.PROX
sách = inanimate
cái cuốn sách này
FOC CLF book DEM.PROX
"this very book"
cái
FOC
con
CLF
mèo
cat
này
DEM.PROX
mèo = non-human
cái con mèo này
FOC CLF cat DEM.PROX
"this very cat"
cái
FOC
người
CLF
lính
soldier
này
DEM.PROX
lính = human
cái người lính này
FOC CLF soldier DEM.PROX
"this very soldier"
Functionally, cái indicates grammatically that an element within a noun phrase is in contrastive focus. It has been noted by Nguyễn Đ. H. (1997) (and others) that cái adds a pejorative connotation, as in:
    cáiFOCthằngCLFchồnghusbandemKINcái thằng chồng emFOC CLF husband KIN nó3SG.PNnó3SG.PN chẳngNEGraturn.outgìINTERR.INAN.PNchẳng ra gìNEG turn.out INTERR.INAN.PN topicalized noun phrase subj noun phrase predicate "that husband of mine, he is good for nothing"
However, Nguyễn Hùng Tưởng (2004) claims that the connotation is not always negative and gives the following positive example:
    tôi1SG.PNtôi1SG.PN gặpmeetgặpmeet cáiFOCconCLFnhỏlittletử tếkindcái con nhỏ {tử tế}FOC CLF little kind subj noun phrase verb obj noun phrase "it is the kind-hearted girl that I met"
Phonologically, the focus cái receives an intonational stress, and, in addition, the element receiving the focus also receives an intonational stress. In the following examples, the stressed words are indicated with capital letters (also underlined):
    tôi1SG.PNtôi1SG.PN thíchlikethíchlike CÁIFOCconCLFngựahorseĐENblackCÁI con ngựa ĐENFOC CLF horse black subj noun phrase verb obj noun phrase "I like the BLACK horse" (but not the horse that's a different color)
In the above sentence, the item in focus is đen "black", which receives the stress (as does cái). Here, it is the feature of the horse's blackness that is being focused on (or singled out) in contrast to other horses that do not have the feature of blackness. In the sentence below, ngựa "horse" receives the focus and stress.
    tôi1SG.PNtôi1SG.PN thíchlikethíchlike CÁIFOCconCLFNGỰAhorseđenblackCÁI con NGỰA đenFOC CLF horse black subj noun phrase verb obj noun phrase "I like the black HORSE" (but not the other black animal)
The focus marker is always stressed and must co-occur with another stressed item; thus, cái cannot occur without another stressed element within the noun phrase. Focus cái may focus a variety of noun phrase elements including prepositional phrases, relative clauses, constituents inside of relative clause modifiers, the head noun (by itself), the head noun plus preceding classifier, and adjectival verbs.

#### Classifier position

Vietnamese uses a rich set of classifiers and measure words (often considered a subset of the classifiers) to introduce or stand in for count and mass nouns, respectively. This feature of Vietnamese is similar to the system of classifiers in Chinese.
The most common classifiers typically do not translate to English: cái introduces most inanimate objects, while con generally introduces animate objects, especially animals. In the following dialogue, the classifier con initially introduces "chicken":
Bán
sell
cho
for
tôi
me
bốn
four
con
CLF.ANIM
gà.
chicken
Bán cho tôi bốn con gà.
sell for me four CLF.ANIM chicken
"Sell me four chickens."
Bao nhiêu?
how many
{Bao nhiêu?}
{how many}
"How many?"
Bốn
four
con.
CLF.ANIM
Bốn con.
four CLF.ANIM
"Four [of them]."
Nouns may require the animate classifier even if they do not refer to living organisms. For instance, dao (knife), đường (road), mắt (eye), sông (river), and vít (screw) all take the con classifier to convey motion.
More specific classifiers typically indicate the shape of objects, such as quả for round objects like balls or pieces of fruit, or tấm for flat, rectangular objects like signage or panes of glass. These classifiers may be superficially likened to English partitive constructions like one head of cattle ("head", always singular regardless of number, indicates large livestock), two sticks of dynamite ("stick" indicates something relatively rigid, long and comparatively thin), three strands of hair ("strand" indicates something flexible, long and quite thin), or four bars of gold (a "bar" being similar to a "stick", but comparatively less "thin"). Some nominalizing classifiers introduce verbs or adjectives instead of nouns.
Some linguists count as many as 200 classifiers in Vietnamese, though only a few are used in conversation or informal writing. Thompson (1987) notes that usage of cái for inanimate objects has increased at the expense of some of the rarer classifiers.
Among the most common classifiers are:
* cái : used for most inanimate objects
* chiếc: almost similar to cái, usually more connotative (e.g. when referring to a cute object, chiếc might be more suitable than cái)
* con: usually for animals and children, but can be used to describe some non-living objects that are associated with motion
* người: used for people except infants
* bài: used for compositions like songs, drawings, poems, essays, etc.
* câu: sentential constructs (verses, lyrics, statements, quotes, etc.)
* cây: used for stick-like objects (plants, guns, canes, etc.)
* chuyện: a general topic, matter, or business
* lá: smaller sheets of paper (letters, playing cards)
* tòa: buildings of authority: courts, halls, "ivory towers".
* quả/trái: used for globular objects (the Earth, fruits)
* quyển/cuốn: used for book-like objects (books, journals, etc.)
* tờ: sheets and other thin objects made of paper (newspapers, papers, calendars, etc.)
* việc: an event or an ongoing process
Classifiers are required in the presence of a quantifier, except for "non-classified nouns": "time units" such as phút (minute), geographical and administrative units such as tỉnh (province), and polysyllabic Sino-Vietnamese compound nouns.
The classifier cái has a special role in that it can introduce any other classifier, e.g. cái con, cái chiếc, but Nguyễn Hùng Tường (2013) considers this to be a non-classifier use of cái.

#### Attributive modifier position

includes noun phrase modifiers, verb phrase modifiers

#### Demonstrative position

Nouns may be modified by certain demonstratives that follow the noun (see also demonstrative section below). These demonstratives include: này "this", nầy "this", nay "this", ni "this", đó "that", nấy "that", ấy "that", nãy "that", kia "that yonder", nọ "that yonder", kìa "that yonder (far)", nào "which". Examples:

#### Prepositional phrase position

Possession is shown in Vietnamese via a prepositional phrase that modifies the next word, a noun. Any words after that are subsequent to that are, essentially, articles or demonstratives that bring up qualifying clauses.

#### Reference, specificity, definiteness

Vietnamese nouns that stand alone are unmarked for number and definiteness. Thus, a noun, such as sách, may be glossed in English as "a book" (singular, indefinite), "the book" (singular, definite), "some books" (plural, indefinite), or "the books" (plural, definite). It is with the addition of classifiers, demonstratives, and other modifiers that the number and definiteness can be specified.
* reference
** specific vs. generic reference generic mood & generic antecedents
** definiteness (identifiability of referent)
* count noun vs. mass noun
* interaction with classifiers (presence and absence thereof)
* see Behrens (2003)

### Pronouns

Vietnamese pronouns act as substitutions for noun phrases.
Thus, the third person singular (arrogant) pronoun nó can substitute for a simple noun phrase Hoan (a personal name) consisting of a single noun or a complex noun phrase con chó này consisting of a noun plus modifiers (which, here, are a classifier and a demonstrative).
Note that the pronominal system as a whole also includes kinship terms (see kinship term section below) and certain demonstratives (see demonstrative section below), which can also have a pronominal function.
The pronouns are categorized into two classes depending on whether they can be preceded by the plural marker chúng. Like other Asian pronominal systems, Vietnamese pronouns indicate the social status between speakers and other persons in the discourse in addition to grammatical person and number. The table below shows the first class of pronouns that can be preceded by pluralizer.
    Singular Plural 1st person tôi (inferior to superior) – ta (emphatic, superior to inferior) ta (emphatic, superior to inferior) tao (superior to inferior, familiar) – mình (intimate) mình (intimate) 2nd Person mày or mi or bay (superior to inferior, familiar) bay (superior to inferior, familiar) 3rd Person nó (superior to inferior, familiar) y (southern dialect only, see below) –
The first person tôi is the only pronoun that can be used in polite speech. The second person ta is often used when talking to oneself as in a soliloquy, but also indicates a higher status of the speaker (such as that of a high official, etc.). The other superior-to-inferior forms in the first and second persons (tao, mày, mi, bay) are commonly used in familiar social contexts, such as among family members (e.g. older sister to younger sister, etc.); these forms are otherwise considered impolite. The third person form nó (used to refer to inanimates, animals, children, and scorned adults, such as criminals) is considerably less arrogant than the second person forms tao, mày, mi, bay. The pronoun mình is used only in intimate relationships, such as between husband and wife.
The pronominal forms in the table above can be modified with plural chúng as in chúng mày "you (guys)", chúng nó "them". There is an exclusive/inclusive plural distinction in the first person: chúng tôi and chúng tao are exclusive (i.e., me and them but not you), chúng ta and chúng mình are inclusive (i.e., you and me). Some of the forms (ta, mình, bay) can be used to refer to a plural referent, resulting in pairs with overlapping reference (e.g., both ta and chúng ta can mean "inclusive we", both bay and chúng bay can mean "you guys").
The other class of pronouns are known as "absolute" pronouns (Thompson 1965). These cannot be modified with the pluralizer chúng. Many of these forms are literary and archaic, particularly in the first and second person.
    Singular Plural 1st person min (familiar, literary) choa (literary) qua (male to female, literary) thiếp (female to male, literary) Trẫm (king to subject, archaic) thần (subject to king, archaic) 2nd Person bậu (female to male, literary) – chàng (female to male, literary) ngài (subject to king, archaic) 3rd Person y (familiar) người ta (generic) hắn (familiar) va (familiar) người ta (generic)
Unlike third person pronouns of the first type, these absolute third person forms (y, hắn, va) refer only to animate referents (typically people). The form y can be preceded by the pluralizer in southern dialects in which case it is more respectful than nó. The absolute pronoun người ta has a wider range of reference as "they, people in general, (generic) one, we, someone".
As a result of language contact, some linguists have noted that some Vietnamese speech communities (especially among young college students and bilingual speakers) have borrowed French and English pronouns moi, toi, I, and you in order to avoid the deference and status implications present in the Vietnamese pronominal system (which lacks any truly neutral terms).

### Verbs and verb phrases

As mentioned in the noun section above, verbs can be distinguished from nouns by their ability to function as predicators by themselves without a preceding copula là. Additionally, verbs may be categorized into two main subtypes, stative and functive, according to their syntactic behavior.

#### Stative verbs

Stative verbs (also known as verbs of quality, extended state verbs, adjectival verbs or adjectives) can be distinguished from functive verbs in two:
* stative verbs occur with a degree modifier such as rất ‘very’
* stative verbs preclude the use of exhortatives such as hãy
    Giáp rất cao
    “Giap is very tall”
    *Hãy trắng! (ungrammatical)
    “Be white!”

#### Functive verbs

Functive verbs (also known as "real" verbs, verbs of action, "doing" words, or momentary action verbs) differ from stative verbs by the same syntactic tests:
* functive verbs cannot be preceded by a degree modifier such as rất "very"
* functive verbs can be preceded by the exhortative hãy "let's (do)" (indicates commands, requests, etc.)
    *Giáp rất ăn. (ungrammatical)
    "Giap very eat."
    Anh hãy ăn đi!
    "Go ahead and eat!"
A verb can interleave with a direct object for emphasis:
biết
to know
thân phận
social status
biết thân biết phận
to know one's place
{biết} + {thân phận} → {biết thân biết phận}
{to know} + {social status} → {to know one's place}
đi
to go
tới lui
back and forth
đi tới đi lui
to go back and forth
{đi} + {tới lui} → {đi tới đi lui}
{to go} + {back and forth} → {to go back and forth}
nói
to speak
bậy bạ
objectionable
nói bậy nói bạ
to speak objectionably
{nói} + {bậy bạ} → {nói bậy nói bạ}
{to speak} + {objectionable} → {to speak objectionably}
In the last example, the verb nói splits the bound morphemes of the reduplicated word bậy bạ.

#### Tense markers

Although it is not required, Vietnamese has many particles that are used to mark tenses. However, they are not always used as context may suffice. All these markers, except "rồi" which goes after the verb, go before the verb. (Below each point, there is an example of the marker being used with the verb "to have dinner" or "ăn tối".)
* To make the past tense, use "đã"
Tôi đã ăn tối – I had dinner
* To make the future tense, use "sẽ"
Tôi sẽ ăn tối – I will have dinner
* To say that you just did something (eg. I just ate), use "vừa mới". However it is possible to remove either "vừa" or "mới" and keep the same meaning, however removing "vừa" is more common.
Tôi vừa mới ăn tối – I just had dinner
* To say that you are about to do something (eg. I am about to eat), use "sắp".
Tôi sắp ăn tối – I am about to have dinner
* To say that you already did something (eg. I already ate), use "rồi". It is often used with "đã"
Tôi (đã) ăn tối rồi – I already had dinner
* To make a verb continuous (eg. I am eating), use "đang". It can be combined with most of the tense markers, however this isn't common usage.
Tôi đang ăn tối – I am having dinner Tôi đã đang ăn tối – I was having dinner
* "Có" is also used as a past tense of the verb very similar to "đã". It has other uses outside of this.

### Passivization

The active voice can be changed to passive voice by adding the following words: "được" if the verb describing the action implies beneficial effects for the agent and "bị" if the verb describing the action implies negative effects. The words "được" and "bị" must stand in front of the main verb.
    Trà được trồng ở Nhật Bản
    Tea is grown in Japan.
An agent, if there is one, is often placed in between the passive particle and the main verb:
Trần Lập
Trần Lập
được
PASS
nhiều người
many people
biết tới
know about
{Trần Lập} được {nhiều người} {biết tới}
{Trần Lập} PASS {many people} {know about}
Trần Lập is known about by many people. (Many people know about Trần Lập.)
When used with intransitive verbs (and adjectives), these two particles imply the subject is a passive participant to the action described by the verb, as in following example:
    Anh ta bị chóng mặt
    He is feeling dizzy

### Topic–comment structure

The topic–comment structure is an important sentence type in Vietnamese. Therefore, Vietnamese has often been claimed to be a topic-prominent language (Thompson 1991). As an example the sentence "Tôi đọc sách này rồi." ("I've already read this book.") can be transformed into the following topic prominent equivalent. Note that the topic marker can also be dropped.
    Sách này (thì) tôi đọc rồi
    This book (TOPICMARKER) I read already

## Lexicon
### Kinship terms

Kinship terms in Vietnamese have become grammaticalized to a large extent and thus have developed grammatical functions similar to pronouns and other classifiers. In these cases, they are used as honorifics or pejoratives. Kinship terms may also, of course, be used with a lexical meaning like other nouns.

#### Pronominal function

When used with a pronominal function, kinship terms primarily indicate the social status between referents in a discourse, such as between the speaker and the hearer, between speaker and another referent, etc. Included within the notion of social status are classifications of age, sex, relative social position, and the speaker's attitude.
For example, one can express the meaning of I love you in Vietnamese using many different pronouns.
* Anh yêu em (male to female [or younger male] lover)
* Em yêu anh (female [or younger male] to male lover)
* Mẹ yêu con (mother to child)
* Con yêu mẹ (child to mother)
The most common terms of reference are kinship terms, which might differ slightly in different regions.
When addressing an audience, the speaker must carefully assess the social relationship between him/her and the audience, difference in age, and sex of the audience to choose an appropriate form of address. The following are some kinship terms of address that can be used in the second-person sense (you). They all can also be used in the first-person sense (I), but if they're not marked by (S) the usage is limited to the literal meaning:
* Ông: grandfather, used as a term of respect for a man senior to the speaker and who is late middle age or older
* Bà: grandmother, used as a term of respect for a (usually married) woman senior to the speaker and who is late middle age or older
* Bá: parent's older sister, used to address a woman slightly older than one's parents or wife of father's older brother or wife of mother's older brother.
* Bác: parent's older brother or sister, used to address a man/woman slightly older than one's parents or husband of father's older sister or husband of mother's older sister.
* Cô: father's sister, used to address a younger woman or a woman as old as one's father; also used to address a female teacher regardless of relative age
* Cậu: mother's brother, used to address a younger man or a man as old as one's mother
* Dì: mother's sister, used to address a younger woman or a woman as old as one's mother; also used to address one's stepmother
* Chú: father's younger brother, used to address a man slightly younger than one's father or husband of father's younger sister.
* Thím: wife of father's younger brother.
* Mợ: wife of mother's younger brother.
* Dượng: husband of father's older sister; also used to address one's stepfather
* Anh: older brother, for a slightly older man, or for the man in a romantic relationship. (S)
* Chị: older sister, for a slightly older woman. (S)
* Em: younger sibling, for a slightly younger person, or for the woman [or younger man] in a romantic relationship. (S)
* Bố/Ba/Cha: father
* Mẹ/Má/Mợ: mother
* Con: child; also used in some regions to address a person as old as one's child
* Cháu: nephew/niece, grandson/granddaughter; used to address a young person of around such relative age
Using a person's name to refer to oneself or to address another is considered more personal and informal than using pronouns. It can be found among close friends or children.

### Demonstratives

Vietnamese demonstratives (markers of deixis) all have the function of identifying a referent with respect to another contextual point or position. For example, the demonstrative này "this" as in the noun phrase người này "this person" indicates that the person referred to is relatively close to the speaker (in a context where this noun phrase is uttered by a speaker to an addressee) while the demonstrative đó "that" as in the noun phrase người đó "that person" indicates that the person referred to is further from the speaker.
The demonstratives have a basic three-term deictic system — proximal (close – "this, here"), medial (far – "that, there"), distal (very far – "yonder, over there") — plus an indefinite (or interrogative) term ("which, where"). In addition to their deictic function, different Vietnamese demonstratives can function variously as noun modifiers, as noun phrases (i.e., a (pro-) nominal function), or as adverbials.
    Function Proximal Medial Distal Indefinite Nominal đây "here" đấy "there" – đâu "where, wherever" Nominal/Noun modifier – đó "there, that" kia/kìa "over there, yonder" (bidirectional) – Noun modifier này/nầy/nay/ni "this" nấy/ấy "that" nọ "yonder" (unidirectional – past) nào "which(ever)" Proportion bây "to this extent" bấy "to that extent, to such an extent" bao "to what(ever) extent" Manner vầy "this way, thus" vậy "that way, so" sao "how(ever)"
The form này tends to be used in Northern Vietnamese while nầy is the Southern form and ni is the North-central and Central form. In North-central and Central Vietnamese, the form nớ is used instead of nọ, mô instead of nào and đâu, rứa instead of vậy, and răng instead of sao.
In Hanoi, the form thế or như thế "(like) so, (like) this way" is used instead of vầy. Other forms mentioned in Thompson (1965) are nay "this", nây "this (temporal)", nãy or nẫy "that (just past)", and nao "which".
The basic formal pattern of the demonstratives is that the initial consonant and ending vowel nucleus indicate their function and position in the deictic system. Some linguists have analyzed demonstratives as consisting of two (sub-syllabic) morphemes. Following this, the initial đ- indicates a nominal, n- a noun modifier, b- proportion, v-~s- manner, and the vowels -ây~-ay proximal/medial, -âu~-ao indefinite, and -o medial/distal. However, the form kia is analyzed as consisting of only one morpheme. Overlaid on these elements are tones, which indicate contrastive distances increasingly further from the contextual position: ngang tone (closest), huyền tone (further), sắc or nặng tone (even further). Thus, đấy is more remote than đây, kìa more remote than kia, vậy more remote than vầy. There is an idiomatic expression where demonstratives with an even increasing distance modify the noun ngày "day(time)":
    ngày kia, ngày kìa, ngày kía, ngày kịa, ngày kĩa "on and on into the future"
Syntactically, the demonstratives đó and kia may function as either nouns or as noun modifiers:
    ngườipersonđóthatngười đóperson that làbelàbe anhbrothernó3SG.PNanh nóbrother 3SG.PN subj noun phrase verb obj noun phrase "That person is his brother."
    đóthatđóthat làbelàbe anhbrothernó3SG.PNanh nóbrother 3SG.PN subj noun phrase verb obj noun phrase "That is his brother."
The nominals đây, đấy, and đâu are only used as nouns typically denoting a space or time and cannot function as noun modifiers. Although they usually refer to position situated in time/space, the nominal deictics can be used to metaphorically refer to people, as in:
đây
this
đi
go
chợ,
market,
đấy
that
có
AFF
đi
go
không?
NEG
đây đi chợ, đấy có đi không?
this go market, that AFF go NEG
"I'm going to the market, what about you?"
In the sentence above (which would translate more literally as "This is going to the market, is that going or not?"), proximal đây is used to refer (metaphorically) to the speaker (as "I") while medial đấy is used to refer to the addressee (as "you"). The demonstrative noun modifiers này, (n)ấy, nọ, and nào can only modify nouns and cannot stand alone as nouns.
When referring to time, the distal demonstratives kia and nọ differ in directionality. Kia specifies a point remote either in the past or the future while nọ specifies only a remote point in the past:
* ngày kia "some day to come, the other day"
* ngày nọ "the other day"
The proportion demonstratives (bây, bấy, bao) refer to the extent of measurement of time or space. They precede the words they modify, such as giờ "time", nhiêu "(to have) much/many", lâu "(to be) long, (take a) long time":
* bây giờ "now, this time"
* bấy giờ "then, that time"
* bao giờ "when, what time"
* bây nhiêu "this much/many"
* bấy nhiêu "that much/many"
* bao nhiêu "how much/many"
* bấy lâu "all that long period, for that length of time"
* bao lâu "how long"
* bao ngày "how many days"
* bao lớn "how big"
* bấy xa "that far"

### Numerals

Numerals (or numbers) consist of two types: cardinal numerals and ordinal numerals. When occurring in noun phrases, cardinal and ordinal numerals occur in different syntactic positions with respect to the head noun. The article below only shows the native Vietnamese numerals, remember that Sino-Vietnamese numerals will be used in certain cases.

#### Cardinal

Vietnamese numerals are a decimal system. "Zero" lacks a dedicated numeral with số không "empty number" (< số "number", không "empty") being used.

##### Numbers 1-99

Numerals are generally analytic, with multiples of ten following a regular pattern.
    base numeral+ 10× 10 1 một ~ mốtmười một (11) – 2 haimười hai (12)hai mươi (20) 3 bamười ba (13)ba mươi (30) 4 bốn, tưmười bốn (14)bốn mươi (40) 5 nămmười lăm (15)năm mươi (50) 6 sáumười sáu (16)sáu mươi (60) 7 bảy or bẩymười bảy (17)bảy mươi (70) 8 támmười tám (18)tám mươi (80) 9 chínmười chín (19)chín mươi (90) 10 mười –(mười mươi) (100)
Additive compounds are formed by with mười- "10" initially and another numeral following: mười tám ("10" + "8" = "18"). Multiplicative compounds are formed with an order that is the reverse of the additive compounds, i.e. -mươi is preceded by another numeral: tám mươi ("8" x "10" = "80").
Consonantal and tonal alternations occur in some compound numerals. The numeral mười "10" in multiplicative compounds has a tonal change (huyền tone > ngang tone) to -mươi "times 10", as in:
    bốn mươi "40" (instead of *bốn mười)
The numeral một "1" undergoes a tonal alternation (nặng tone > sắc tone) to mốt when it occurs after mươi (with ngang tone) in multiples of 10, as in:
    bốn mươi mốt "41" (instead of *bốn mươi một)
The numeral năm "5" undergoes an initial consonant alternation (n > l) to lăm as the final element in additive compounds, as in:
    mười lăm "15" (instead of *mười năm)
    bốn mươi lăm "45" (instead of *bốn mươi năm)

##### Numbers 100-999

The Vietnamese word for hundred is trăm. Number formation generally follows the same logic as before, with the same consonantal and tonal shifts. However, with the numbers 101–109, 201–209 and so on, a placeholder lẻ ("odd") or linh is inserted to represent "zero tens."
    100 một trăm 200 hai trăm 900 chín trăm 101 một trăm lẻ/linh một 201 hai trăm lẻ/linh một 901 chín trăm lẻ/linh một 102 một trăm lẻ/linh hai 202 hai trăm lẻ/linh hai 902 chín trăm lẻ/linh hai 105 một trăm lẻ/linh năm 205 hai trăm lẻ/linh năm 905 chín trăm lẻ/linh năm 110 một trăm mười 210 hai trăm mười 910 chín trăm mười 111 một trăm mười một 211 hai trăm mười một 911 chín trăm mười một 112 một trăm mười hai 212 hai trăm mười hai 912 chín trăm mười hai 115 một trăm mười lăm 215 hai trăm mười lăm 915 chín trăm mười lăm 120 một trăm hai mươi 220 hai trăm hai mươi 920 chín trăm hai mươi 121 một trăm hai mươi mốt 221 hai trăm hai mươi mốt 921 chín trăm hai mươi mốt 122 một trăm hai mươi hai 222 hai trăm hai mươi hai 922 chín trăm hai mươi hai 125 một trăm hai mươi lăm 225 hai trăm hai mươi lăm 925 chín trăm hai mươi lăm 155 một trăm năm mươi lăm 255 hai trăm năm mươi lăm 955 chín trăm năm mươi lăm
* "Lẻ" is more in the south of Vietnam, while "linh" is more common in the north of Vietnam.

##### Numbers 1,000–999,999

The Vietnamese word for thousand is ngàn (Southern) or nghìn (Northern). With the numbers 1,001–1,099, 2,001–2,099 and so on, the empty hundreds place must be specified with không trăm ("zero hundreds").
    1,000 một ngàn/nghìn 10,000 mười ngàn/nghìn 21,000 hai mươi mốt ngàn/nghìn 155,000 một trăm năm mươi lăm ngàn/nghìn 1,001 một ngàn/nghìn không trăm lẻ/linh một 10,001 mười ngàn/nghìn không trăm lẻ/linh một 21,001 hai mươi mốt ngàn/nghìn không trăm lẻ/linh một 155,001 một trăm năm mươi lăm ngàn/nghìn không trăm lẻ/linh một 1,021 một ngàn/nghìn không trăm hai mươi mốt 10,021 mười ngàn/nghìn không trăm hai mươi mốt 21,021 hai mươi mốt ngàn/nghìn không trăm hai mươi mốt 155,021 một trăm năm mươi lăm ngàn/nghìn không trăm hai mươi mốt 1,055 một ngàn/nghìn không trăm năm mươi lăm 10,055 mười ngàn/nghìn không trăm năm mươi lăm 21,055 hai mươi mốt ngàn/nghìn không trăm năm mươi lăm 155,055 một trăm năm mươi lăm ngàn/nghìn không trăm năm mươi lăm 1,100 một ngàn/nghìn một trăm 10,100 mười ngàn/nghìn một trăm 21,100 hai mươi mốt ngàn/nghìn một trăm 155,100 một trăm năm mươi lăm ngàn/nghìn một trăm 1,101 một ngàn/nghìn một trăm lẻ/linh một 10,101 mười ngàn/nghìn một trăm lẻ/linh một 21,101 hai mươi mốt ngàn/nghìn một trăm lẻ/linh một 155,101 một trăm năm mươi lăm ngàn/nghìn một trăm lẻ/linh một 1,121 một ngàn/nghìn một trăm hai mươi mốt 10,121 mười ngàn/nghìn một trăm hai mươi mốt 21,121 hai mươi mốt ngàn/nghìn một trăm hai mươi mốt 155,121 một trăm năm mươi lăm ngàn/nghìn một trăm hai mươi mốt
* "Ngàn" is more in the south of Vietnam, while "nghìn" is more common in the north of Vietnam.

##### Numbers 1,000,000 and Above

The word for 10$^6$ ("million") is triệu. The word for 10$^9$ (short-scale "billion" or long-scale "milliard") is tỉ. Above this, combinations of ngàn/nghìn, triệu and tỉ must be used.
| 1 × 10$^6$ | một triệu | 1 × 10$^{18}$ | một tỉ tỉ |
| 1 × 10$^9$ | một tỉ | 1 × 10$^{21}$ | một ngàn tỉ tỉ |
| 1 × 10$^{12}$ | một ngàn tỉ | 1 × 10$^{24}$ | một triệu tỉ tỉ |
| 1 × 10$^{15}$ | một triệu tỉ | 1 × 10$^{27}$ | một tỉ tỉ tỉ |

#### Ordinal

Ordinal numerals are formed by adding the thứ- ordinal prefix to cardinal numerals: thứ- + mười "ten" = thứ mười "tenth".
Other examples include:
* thứ nhất "first"
* thứ hai (or thứ nhì) "second"
* thứ ba "third"
* thứ bốn (or thứ tư) "fourth"