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The perfective aspect is distinguished from the imperfective aspect, which presents an event as having internal structure (such as ongoing, continuous, or habitual actions). The term perfective should be distinguished from perfect (see below). The distinction between perfective and imperfective is more important in some languages than others.
This is the case, for example, in Mandarin Chinese, with the perfective suffix le and (especially) the imperfective zhe. For some verbs in some languages, the difference between perfective and imperfective conveys an additional meaning difference; in such cases, the two aspects are typically translated using separate verbs in English.
The two aspects may be combined on the same verb in a few languages, for perfective imperfectives and imperfective perfectives. Georgian and Bulgarian, for example, have parallel perfective-imperfective and aorist-imperfect forms, the latter restricted to the past tense. In Bulgarian, there are parallel perfective and imperfective stems; aorist ...
Perfective verbs are commonly formed from imperfective ones by the addition of a prefix; conversely the imperfective verb can be formed from the perfective one by modification of the stem or ending. Suppletion also plays a small role. Perfective verbs generally cannot be used with the meaning of a present tense – their present-tense forms in ...
[18]: p.76 The indicative mood has simple forms (one word, but conjugated by person and number) for the present tense, the imperfective aspect in the past tense, the perfective aspect in the past, and the future (and the future form can also be used to express present probability, as in the English "It will be raining now").
The basic (present) perfect form, with the auxiliary in the present tense, may specifically carry the meaning of perfect aspect, as in English; however in some languages it is used more generally as a past tense (or preterite), as in French and German. The use of auxiliaries and meaning of the constructions in various languages are described below.
China's new Type 055 cruiser is its most modern and powerful surface combatant. The ship China labels as a destroyer is so large it compares more to US cruisers.
In the Slavic languages, verbs are intrinsically perfective or imperfective. In Russian and some other languages in the group, perfective verbs have past and "future tenses", while imperfective verbs have past, present and "future", the imperfective "future" being a compound tense in most cases. The "future tense" of perfective verbs is formed ...