Imperfect
The imperfect (abbreviated ) is a verb form that combines past tense (reference to a past time) and imperfective aspect (reference to a continuing or repeated event or state). It can have meanings similar to the English "was walking" or "used to walk". It contrasts with preterite forms, which refer to a single completed event in the past. Traditionally, the imperfect of languages such as Latin and French is referred to as one of the tenses, although it actually encodes aspectual information in addition to tense (time reference). It may be more precisely called past imperfective. English has no general  imperfective and expresses it in different ways. The term "imperfect" in English refers to forms much more commonly called "past progressive" or "past continuous" (e.g. "was doing" or "were doing"). These are combinations of past tense with specifically continuous or progressive aspect. In German, formerly referred to the simply conjugated past tense (to contrast with the or compound past form), but the term (preterite) is now preferred, since the form does not carry any implication of imperfective aspect. "Imperfect" comes from the Latin "unfinished", because the imperfect expresses an ongoing, uncompleted action. The equivalent Ancient Greek term was "prolonged". Indo -European languages. English. Imperfect meanings in English are expressed in different ways depending on whether the event is continuous or habitual. For a continuous action (one that was in progress at a particular time in the past), the past progressive (past continuous) form is used, as in "I was eating"; "They were running fast." However certain verbs that express state rather than action do not mark the progressive aspect (see ); in these cases the simple past tense is used instead: "He was hungry"; "We knew what to do next." Habitual (repeated) action in the past can be marked by "used  to", as in "I used to eat a lot", or by the auxiliary verb "would", as in "Back then, I would eat early and would walk to school." (The auxiliary "would" also has other uses, such as expressing conditional mood.) However, in many cases the habitual nature of the action does not need to be explicitly marked on the verb, and the simple past is used: "We always ate dinner at six o'clock." Italic languages. Latin. Conjugation of the imperfect indicative: Notes: Romance languages. In Romance languages, the imperfect is generally a past tense. Its uses include representing: A common  mistake of beginners learning a Romance language is putting too much emphasis on whether the time the action occurred is known. This generally does "not" affect how the imperfect is used. For example, the sentence ""Someone ate all of my cookies."" (when translated) is not a good candidate for the imperfect. Fundamentally, it is no different from the sentence ""We ate all the cookies."" Note this fails the "repeatability" requirement of the imperfect, as it is only known to have happened once. On the other hand, the sentence ""I used to have fun in the 1960s."" is a good candidate  for the imperfect, even though its period is known. In short, knowing "when" an action occurred is not nearly as important as "how long" it occurred (or was and still is occurring). French. To form the imperfect for French regular verbs, take the first person plural present tense, the "nous" (we) form, subtract the "-ons" suffix, and add the appropriate ending (the forms for "être" (to be), whose "nous" form does not end in "-ons", are irregular; they start with "ét-" but have the same endings). Verbs that terminate in a stem of -cer and -ger undergo minor orthographic changes  to preserve the phonetic sound or allophone. Verbs whose root terminates in the letter "i" maintain the letter despite the consecutiveness in the "nous" and "vous" forms. It is used to express the ideas of habitual actions or states of being; physical and emotional descriptions: time, weather, age, feelings; actions or states of an unspecified duration; background information in conjunction with the passé composé; wishes or suggestions; conditions in "si" clauses; the expressions "être en train de" and "venir de" in the past. Italian. Conjugation of the imperfect indicative: Notes: Romanian. Conjugation of the imperfect indicative: Notes: Spanish. In Spanish , the imperfect can be called the "imperfecto" or the "copretérito". Conjugation of the imperfect indicative: Portuguese. In Portuguese, the imperfect indicative, called "pretérito imperfeito", is quite similar to Spanish: There are four irregular verbs: "pôr" (to put), "ser" (to be), "ter" (to have) and "vir" (to come). Unlike in Spanish, the verbs "ver" (to see) and "ir" (to go) are "regular" in the Portuguese imperfect. Like in Italian, it is also commonly formed by combining the imperfect of the verb estar (estava, estavas, estava, estávamos, estáveis, estavam) with the gerund (for example, "falando", the gerund form of "falar", to speak , to talk). In Brazilian Portuguese, both in informal oral speech and informal written language (for example, online or phone texting), it is more common to use the composite "estava falando" (commonly reduced to "tava falando"), than to use the synthetic "falava", which is more common in formal written forms. Both in European and Brazilian Portuguese, the synthetic pluperfect ("eu falara" "I had spoken") is considered old-fashioned and never used in spoken communication - it is substituted by the composite "eu tinha falado", which is formed with the imperfect form of the verb "ter" (to have) (tinha tinhas tinha tínhamos tínheis  tinham) plus the past participle ("falado"). Alternatively, the verb "ter" can be swapped with the imperfect form of the verb "haver" (to have) (havia havias havia haviamos havíeis haviam) Galician. Similar to the closely related Portuguese, as well as to Spanish, but often called "copretérito" (from "co-", same particle found in English "collaboration" and "coexistence", plus "pretérito", which is "past tense", in reference of it being a second past tense that exists along the regular one). Same as with them, in formal usage "ti" and "vós/vosoutros" change to "vostede" and "vostedes" and are followed by the third person. In  verbs ended in "-aer", "-oer", "-aír" and "-oír", the first and second person of the plural show the presence of a diaeresis. Indo-Aryan languages. Hindi. Hindi, an Indo-Aryan language, has indicative imperfect tense conjugation only for the verb होना ("honā") [to be] and the rest of the verbs lack this conjugation. The indicative imperfect forms of होना "(honā)" comes from Sanskrit स्थित "(stʰita)" "standing, situated" which are derived from the PIE root *steh₂- (“to stand”). The imperfect conjugation is derived from a participle form and hence its conjugations agree only with the number and gender of the grammatical  person and not the pronoun itself. So, the grammatically singular pronouns (e.g., मैं "ma͠i" "I" and तू "tū "you"" etc.) are assigned the singular imperfect forms (i.e. था "thā" or थी "thī") depending on the gender of the person or the noun they refer to, and the grammatically plural pronouns (e.g. हम "ham" "we" etc.) are assigned the plural imperfect forms (थे "thē" and थीं "thīm̊"). An exception to this is the pronoun तुम ("tum") which takes in the plural imperfect form (थे "thē)" in masculine gender but singular form (थी "thī") in feminine gender. These imperfect conjugations also act  as copula to form the imperfect past forms for the three grammatical aspects that Hindi hasː Habitual, Perfective, and Progressive aspects. Assamese. In Assamese, two imperfect forms are recognisedː present progressive and/or present perfect & past progressive and/or remote past. There is only one periphrastic tense which functions as both the present progressive and present perfect with reference to the setting in which is placed. Indo-Iranian languages. Persian. Like all other past tenses, imperfect is conjugated regularly for all verbs. Formation: "[preverb] + mi- + past stem + past ending." Conjugation of the imperfect indicative for the first person singular  is shown in the table belowː Slavic languages. Most Slavic languages have lost the imperfect but it is preserved in Bulgarian and Macedonian. It is also officially retained in Serbian and Croatian but is considered old-fashioned and restricted to literature for poetic and stylistic reasons. Turkish. Turkish has separate tenses for past continuous and imperfect. To form the past continuous tense for Turkish verbs, after removing the infinitive suffix (-mek or -mak), take the present continuous tense suffix "-yor" without personal suffixes, and add the ending for the simple past plus the appropriate personal suffix To form the negative  of the past continuous tense, the negation suffix "-ma/-me", which becomes "-mi", "-mı", "-mu", or "-mü" because of the closed auxiliary vowel and the vowel harmony, must be added before "-yor". Examples: Semitic languages. Semitic languages, especially the ancient forms, do not make use of the imperfect (or perfect) tense with verbs. Instead, they use the imperfective and perfective aspects, respectively. Aspects are similar to tenses, but differ by requiring contextual comprehension to know whether the verb indicates a completed or non-completed action. Dravidian languages. Malayalam. In Malayalam (verbs are never conjugated for grammatical person, which is indicated by  a pronoun), there are two indicative imperfects, corresponding exactly with English: To make a verb in the imperfect negative, add അല്ല് (all) after the ഉകയ (ukaya) part of the ending for the "was doing" imperfect. For example, ഓടുകയല്ലായിരുന്നു (ōṭukayallāyirunnu) ("...was not running"). To do the same for the "used to do" imperfect, take off the ഉമ (uma) from the ending and add അത്തില്ല (attilla) instead. For example, ഓടത്തില്ലായിരുന്നു (ōṭattillāyirunnu) ("...didn't use to run")