Every Russian verb comes in two aspects — imperfective and perfective — and almost every grammar topic on this site eventually leans on knowing which is which and what each can do. This page is the one-screen consolidation: a single side-by-side table you can keep coming back to. Where the decision guide walks you through how to choose one in a given sentence, this page is its companion from the opposite angle — it lays out all the facts about both aspects at once, so you can classify a situation at a glance. Read the table, then the short notes that unpack its three most useful rows.
The master table
The imperfective (here чита́ть "to read") describes the action as a process, a habit, or a general fact; the perfective (прочита́ть "to read through, finish reading") presents it as a single completed event with a result.
| Dimension | Imperfective (чита́ть) | Perfective (прочита́ть) |
|---|---|---|
| Core meaning | Process, repetition, general fact; the action in progress or as an activity, completion not at issue | A single, bounded, completed action with a result; one event in a sequence |
| Present tense | Yes — я чита́ю "I read / I'm reading" | None. Perfective present-endings = the future, not the present |
| Past tense | я чита́л "I was reading / used to read / read (as an activity)" | я прочита́л "I read it (through), I finished it" |
| Future tense | Compound: бу́ду + infinitive — я бу́ду чита́ть "I'll be reading / will read" | Simple: present-type endings — я прочита́ю "I'll read it (through)" |
| Typical time words | ча́сто "often", всегда́ "always", обы́чно "usually", ка́ждый день "every day", до́лго "for a long time", всё у́тро "all morning" | вдруг "suddenly", уже́ "already", наконе́ц "finally", сра́зу "right away", за час "in an hour", за два дня "in two days" |
| Imperative | Invitation / general instruction (чита́й "go ahead and read"); prohibition when negated (не чита́й "don't read") | One-off request / "get it done" (прочита́й "read it through"); warning when negated (не урони́ "mind you don't drop it") |
| Negated past | не чита́л — "didn't read at all" | не прочита́л — "didn't finish / didn't manage to read" |
How to read the three key rows
"Perfective has no present" — the row to internalize first
This is the single most useful fact in the table, and the one English most resists. A perfective verb has no present tense at all. When you conjugate a perfective with present-tense endings, you get the future: прочита́ю is not "I read" but "I will read it (through)". So anything happening right now is necessarily imperfective — there's nothing to choose.
Сейча́с я чита́ю но́вости.
Right now I'm reading the news. — present = imperfective чита́ю; the perfective has no present.
За́втра я обяза́тельно прочита́ю э́ту главу́.
Tomorrow I'll definitely read through this chapter. — прочита́ю = perfective FUTURE, not present.
The future row: compound vs simple
The two aspects build the future in completely different ways. The imperfective future is compound — the conjugated auxiliary бу́ду / бу́дешь / бу́дет… plus the imperfective infinitive — and stresses the process ("I'll be reading"). The perfective future is simple — present-type personal endings straight on the perfective stem — and stresses the result ("I'll have read it"). Same English "will read", two different Russian structures.
Ве́чером я бу́ду чита́ть, не звони́.
In the evening I'll be reading, don't call. — compound imperfective future: an open-ended process.
Я прочита́ю отчёт и пришлю́ тебе́ пра́вки.
I'll read through the report and send you the edits. — simple perfective future: a completed result, then the next step.
The full mechanics live on Aspect in the future, with separate pages for the compound imperfective and the simple perfective.
The time-word row: your fastest cue
Time words are the quickest way to spot the aspect. Repetition or duration words (ча́сто, всегда́, обы́чно, ка́ждый день, до́лго) pull toward the imperfective — they describe the action as spread out or recurring. Suddenness, completion, or time-to-finish words (вдруг, уже́, наконе́ц, за час) pull toward the perfective — they frame the action as a single finished point.
Она́ ча́сто чита́ет пе́ред сном.
She often reads before bed. — ча́сто → imperfective (a habit).
Я прочита́л всю кни́гу за оди́н ве́чер.
I read the whole book in one evening. — за оди́н ве́чер (time-to-completion) → perfective.
Он до́лго ду́мал, а пото́м вдруг согласи́лся.
He thought for a long time, then suddenly agreed. — до́лго ду́мал (impf., duration) but вдруг согласи́лся (pf., a sudden point).
One pair, every form
To see the whole table in motion, here is чита́ть / прочита́ть laid out across all the forms it can take. Notice the empty cell — there is no perfective present.
| Form | Imperfective | Perfective |
|---|---|---|
| Infinitive | чита́ть | прочита́ть |
| Present (я) | чита́ю | — (none) |
| Past (я, masc.) | чита́л | прочита́л |
| Future (я) | бу́ду чита́ть | прочита́ю |
| Imperative (ты) | чита́й | прочита́й |
Я ка́ждый ве́чер чита́л э́ту кни́гу до́чери, и наконе́ц мы её прочита́ли.
Every evening I read this book to my daughter, and we finally finished it. — habit чита́л (impf.) → completion прочита́ли (pf.) in one breath.
Common Mistakes
❌ Сейча́с я прочита́ю кни́гу (meaning 'I'm reading a book right now').
Wrong — прочита́ю is the perfective FUTURE. The present is always imperfective: Сейча́с я чита́ю.
✅ Сейча́с я чита́ю кни́гу.
I'm reading a book right now.
❌ Я бу́ду прочита́ть отчёт.
Wrong — the compound бу́ду future takes only the IMPERFECTIVE infinitive. The perfective future is simple: Я прочита́ю отчёт.
✅ Я прочита́ю отчёт.
I'll read through the report.
❌ Я ка́ждый день прочита́л газе́ту.
Wrong — 'every day' is a habit → imperfective чита́л. The perfective прочита́л is a single completed act.
✅ Я ка́ждый день чита́л газе́ту.
I read the paper every day.
❌ Я написа́л письмо́ час.
Wrong nuance — bare 'час' (for an hour) is duration → imperfective process: Я писа́л письмо́ час. Use за час with the perfective.
✅ Я написа́л письмо́ за час.
I wrote the letter in an hour.
Key Takeaways
- Imperfective = process / repetition / general fact; it has all three tenses (present, past, compound бу́ду-future).
- Perfective = single completed action with a result; it has only past and a simple future — and no present (perfective present-endings are the future).
- Time words cue the aspect: ча́сто / всегда́ / до́лго → imperfective; вдруг / уже́ / наконе́ц / за час → perfective.
- The future is compound for imperfective (бу́ду чита́ть) and simple for perfective (прочита́ю).
- In negation: не чита́л = "didn't read at all" (impf.); не прочита́л = "didn't finish" (pf.).
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- Verbal Aspect: The Big PictureA2 — Aspect is the spine of the Russian verb: nearly every verb belongs to a pair — imperfective (process, repetition, general fact) and perfective (a single completed whole with a result). This page explains the pair, the consequences for the tense system (perfectives have no present), and why you must decide 'process or result?' before you even pick a tense.
- Decision Guide: Imperfective or Perfective?B1 — A practical, question-ordered procedure you run for every verb. Most aspect agonizing disappears once you notice that some choices are forced (present tense and phase verbs are always imperfective) and the rest reduce to one real question: process or completed result? This page gives you a checklist and walks sentences through it.
- The Imperfective: Process, Repetition, General FactB1 — The imperfective is the aspect of the action viewed from the inside: in progress, habitual, simply named, attempted, or undone again. This page maps its full range — including the experience reading that often matches English present perfect, and the annulled-result use that has no clean English counterpart.
- The Perfective: Completion, Result, Single EventB1 — The perfective is the aspect of the action viewed from the outside as a single completed whole — finished, with a result that stands. This page maps its uses: completion-with-result, chains of events in narration, single momentary acts, and the simple future. The key insight: result-now means perfective (Я уже́ пое́л).
- Aspect and Time ExpressionsB1 — Time adverbials are the most reliable shortcut to aspect: words meaning 'repeatedly' or 'for a duration' (ча́сто, ка́ждый день, до́лго, весь день) force the imperfective, while words meaning 'suddenly', 'finally', or 'within a deadline' (вдруг, наконе́ц, за час, к ве́черу) force the perfective — so scanning a sentence for its time word often decides aspect before any deeper thought.
- Aspect in the Future: Simple vs CompoundB1 — Russian builds the future differently for each aspect, and that construction IS the future-aspect choice: the perfective future is SIMPLE (the perfective verb in present-tense endings — я прочита́ю 'I will read it'), the imperfective future is COMPOUND (бу́ду + imperfective infinitive — я бу́ду чита́ть 'I'll be reading'); the trap is that a perfective in present endings always means the future.