Use the imperfective for actions in progress, habits and repeated actions, or when you’re just naming the activity. Use the perfective for a single action completed with a result. Ask yourself: “Did it get done?” If yes, perfective.
1. The idea: a film or a photo
Think of the imperfective as a film of the action: you see it happening. The perfective is a photo of the result: the action is a single, complete event. English shows this with “was doing” vs “did”, but Russian uses two different verbs. Pick a pair to compare.
2. When to use each aspect
These eight situations cover nearly every choice you’ll make. Four call for the imperfective, four for the perfective.
3. How aspect pairs are made
There’s no single rule, but most pairs follow one of four patterns. The first is by far the most common: add a prefix (a few letters at the start) to make the perfective.
4. Signal words that decide for you
Some time words almost always go with one aspect. If you see one of these in a sentence, the choice is made for you.
5. Aspect and the future tense
Here aspect does something surprising. A perfective verb has no present tense: its “present” endings automatically mean the future. The imperfective future uses бу́ду (“I will be”) plus the infinitive.
| Tense | Imperfective · чита́ть | Perfective · прочита́ть |
|---|---|---|
| Past | ||
| Present | ||
| Future |
6. 20 aspect pairs to learn first
Always learn verbs in pairs: imperfective first (blue), perfective second (red). Tap to hear both.
7. Aspect in commands
Imperfective commands sound like an invitation: “go ahead”. Perfective commands ask for one specific result. Negative commands almost always use the imperfective.
8. Verbs that choose the aspect for you
Verbs about stages of an action (start, continue, finish) take an imperfective infinitive. Verbs like успе́ть (manage) and забы́ть (forget) usually take a perfective.
9. Aspect in the infinitive
The infinitive is the dictionary “to” form (чита́ть, to read). When one verb follows another, the second one is an infinitive, and you still have to choose its aspect. Three groups of words decide it.
Verbs and words about the stages or habits of an action. Even when they are perfective themselves (нача́ть, ко́нчить), the infinitive after them is imperfective, because they describe the process.
| Word | Example | Why |
|---|---|---|
| начина́ть / нача́тьna-chi-NAT’ / na-CHAT’to begin | нача́ть is perfective, but учи́ть after it is imperfective: the learning is a process. | |
| ста́тьstat’to begin (to do) | стать + infinitive is a common way to say “started doing (regularly)”. | |
| продолжа́тьpra-dal-ZHAT’to continue | Continuing is always about a process. | |
| конча́ть / ко́нчить, зака́нчивать / зако́нчитьkan-CHAT’ / KON-chit’to finish | The finishing is completed, but writing stays imperfective. | |
| перестава́ть / переста́тьpi-ri-STAT’to stop (doing) | You stop a process. | |
| броса́ть / бро́ситьBRO-sit’to give up, quit | A habit is a repeated action: imperfective. | |
| устава́ть / уста́тьus-TAT’to get tired of | Tired of a process. | |
| привыка́ть / привы́кнуть, учи́ться / научи́тьсяpri-VYK-nut’ / na-u-CHEET’-sato get used to; to learn how to | A skill or habit is general: imperfective. | |
| не на́до, не ну́жно, не сто́итni NA-da, ni STO-itthere’s no need; it’s not worth | Advising against an action always takes the imperfective. |
Words about succeeding, failing or remembering to do something once. The focus is on the result.
After хоте́ть (want), мочь (can), на́до / ну́жно (must), пора́ (it’s time) and similar, both aspects are possible. The imperfective talks about the activity in general or repeatedly; the perfective about one specific, completed result.
10. Aspect with negation
Negated imperfective means “didn’t at all”. Negated perfective means “didn’t manage” or “didn’t finish”. After не на́до and нельзя́ the aspect changes the meaning too.
11. Choose the aspect
Read the English, look for signal words, and ask: process or result?