Verbal aspect is one of the most distinctive features of Russian. Almost every verb exists in a pair: an imperfective form for ongoing, repeated, or unfinished actions, and a perfective form for completed, single events with a definite result. Examples: писа́ть / написа́ть ("to write"), чита́ть / прочита́ть ("to read"), де́лать / сде́лать ("to do, make").
Choose the imperfective when emphasising the process or repetition (Я чита́л весь ве́чер — "I was reading all evening"). Choose the perfective when emphasising the completed result (Я прочита́л кни́гу — "I read the book [from start to finish]"). Aspect interacts with tense: perfective verbs have no present tense form because completion is incompatible with ongoing time.
Imperfective verbs describe ongoing, repeated, or unfinished actions, while perfective verbs describe completed, single actions with a definite result.
Choose the imperfective aspect when you want to emphasize the process or repetition, and the perfective aspect when you want to emphasize a completed result.
No. Perfective verbs do not have a true present tense because completion is incompatible with an ongoing present action; their present-looking forms refer to the future.
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