Telling the Imperfective from the Perfective | Russian Grammar

Every Russian verb belongs to an aspect — imperfective or perfective — and most verbs come in pairs that share a meaning but differ in aspect (чита́ть / прочита́ть, both "to read"). The previous pages explained what each aspect means; this one teaches the more mechanical skill you need at the same time: when you meet a new pair, how do you tell which is which? There's no single rule that never fails, but a handful of reliable cues will let you guess correctly the vast majority of the time — and the payoff is huge, because it tells you whether прочита́ю means "I read now" or "I will read."

The default: the simpler/base form is imperfective

The starting intuition is that the imperfective is usually the plainer, more basic form — the verb in its "raw," prefix-free state. The imperfective describes an action as a process (something unfolding, repeating, ongoing), so it's the form that names the activity itself. The perfective then adds something to mark completion.

Imperfective (base, process)	Perfective (modified, completed)	Meaning
чита́ть	прочита́ть	to read
писа́ть	написа́ть	to write
де́лать	сде́лать	to do / make
гото́вить	пригото́вить	to cook / prepare

In each row, the left-hand verb is the bare one and the right-hand verb has gained a prefix. So cue 1: if one verb is just the other with a prefix glued on the front, the prefixed one is almost always the perfective.

Я чита́ю кни́гу. (impf чита́ть, process now)

I'm reading a book. — the base form, an ongoing process.

Я прочита́л всю кни́гу за ночь. (pf прочита́ть, completed)

I read the whole book in one night. — the prefixed form, a finished result.

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The "add a prefix → perfective" pattern is the single most useful cue, because it covers a large share of pairs. The most common "empty" perfectivising prefixes are про-, на-, с-, по-, при-, про-: прочита́ть, написа́ть, сде́лать, поза́втракать, пригото́вить. When you see a familiar verb wearing one of these, suspect the perfective. The mechanics are detailed on the prefixation page.

Cue 2: a secondary-imperfective suffix marks the imperfective

The prefix cue has a famous catch. Sometimes a prefixed verb is itself re-imperfectivised by inserting a suffix — typically -ыва-/-ива-, sometimes -ва- or -а- — so that the pair ends up both prefixed, distinguished only by that extra suffix. In these pairs, the member with the longer, suffix-bearing stem is the imperfective, because the suffix literally means "make this a process again."

Perfective (no extra suffix)	Imperfective (with -ыва-/-ива-/-ва-)	Meaning
рассказа́ть	расска́зывать	to tell / narrate
показа́ть	пока́зывать	to show
откры́ть	открыва́ть	to open
дать	дава́ть	to give

So the verb carrying -ыва-/-ива-/-ва-/-а- is imperfective, even when both members are prefixed. Расска́зывать (with -ыва-) is the imperfective; рассказа́ть is the perfective. This is the most reliable suffix cue of all — a stem ballooning out with -ыва-/-ива- is essentially a flag that says "imperfective." These so-called secondary imperfectives are explained in full on the suffixation page.

Он ча́сто расска́зывает э́ту исто́рию. (impf расска́зывать, -ыва-, habitual)

He often tells this story. — the -ыва- form, a repeated process.

Вчера́ он рассказа́л нам всё. (pf рассказа́ть, single completed event)

Yesterday he told us everything. — the shorter form, a single completed telling.

Cue 3: the "sharper," shorter-suffixed member is usually perfective

Some pairs differ not by a prefix but by a stem vowel / suffix swap, and here the shorter, crisper member is typically the perfective. The classic pattern is -ить (pf) vs -ать/-ять (impf): the perfective often has the tighter -и- stem and the imperfective the more drawn-out -а-/-я- stem.

Imperfective (drawn-out -а-/-я-)	Perfective (sharp -и-)	Meaning
реша́ть	реши́ть	to decide / solve
отвеча́ть	отве́тить	to answer
получа́ть	получи́ть	to receive / get
встреча́ть	встре́тить	to meet

The intuition: the longer -а-/-я- stem sounds like a process stretching out (imperfective), while the clipped -и- stem sounds like a single decisive act (perfective). It's a soft tendency, not a law, but it agrees with cue 2: more stem material tends to mean imperfective.

Я до́лго реша́л э́ту зада́чу. (impf реша́ть, drawn-out process)

I spent a long time solving this problem. — the -ать form, a stretched-out process.

Наконе́ц я реши́л её. (pf реши́ть, single completed result)

Finally I solved it. — the -ить form, the decisive completion.

Cue 4: -нуть is usually a one-shot perfective

A verb ending in -нуть is often a semelfactive perfective — a single, instantaneous "one-shot" action — paired with an imperfective in -ать that describes the repeated or drawn-out version.

Он пры́гнул в во́ду. (pf пры́гнуть, -нуть, one jump)

He jumped into the water. — a single, instantaneous jump.

Де́ти пры́гали на крова́ти. (impf пры́гать, repeated)

The kids were jumping on the bed. — repeated, ongoing jumping.

So a -нуть verb is usually perfective (кри́кнуть "give a shout," стукну́ть "give a knock"). Beware the small set of exceptions — verbs like мёрзнуть "to be freezing" or со́хнуть "to dry out" are imperfective -нуть verbs describing gradual states — but the one-shot semelfactives are the common case.

Cue 5: suppletive pairs you simply memorise

Some of the highest-frequency pairs share no visible stem at all — the two aspects come from completely different roots. There is no cue here; you just have to know them. The famous one is the pair for "to say / speak":

Imperfective	Perfective	Meaning
говори́ть	сказа́ть	to say / speak
брать	взять	to take
лови́ть	пойма́ть	to catch
класть	положи́ть	to put (lying)

These suppletive pairs are listed and drilled on their own page. Because they're so common, learn them as fixed two-word units from the start.

Он всегда́ говори́т пра́вду. (impf говори́ть, habitual)

He always tells the truth. — the imperfective root.

Он сказа́л мне пра́вду. (pf сказа́ть, single completed act)

He told me the truth. — the perfective root, a completely different stem.

The dictionary convention — and the payoff

When a dictionary lists a pair, it conventionally cites the imperfective first, then the perfective, often abbreviating the perfective as сов. (соверше́нный вид, "perfective aspect") and the imperfective as несов. (несоверше́нный вид). So an entry like «чита́ть, несов. — прочита́ть, сов.» is telling you the first verb is imperfective.

And here is why this recognition skill matters so much. Only an imperfective verb has a real present tense. A perfective verb conjugated with present-tense endings doesn't mean "now" — it means the future. So the moment you can tell which member is which, you can predict the meaning of the conjugated form:

Form	Aspect	Meaning
чита́ю	imperfective	I read / am reading (now)
прочита́ю	perfective	I will read (through) — FUTURE
пишу́	imperfective	I write / am writing (now)
напишу́	perfective	I will write — FUTURE

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This is the practical payoff of identification. Spot the perfective (usually the prefixed / shorter-suffixed one), and you instantly know its "present-tense" form is really a future. Прочита́ю, напишу́, сде́лаю, скажу́ all mean "I will…," never "I am …-ing." The mechanism is laid out on the perfective simple future page.

Common Mistakes

❌ Treating расска́зывать as the perfective because it's prefixed.

Wrong — the -ыва- suffix overrides the prefix cue. The member with -ыва-/-ива- is imperfective: расска́зывать (impf), рассказа́ть (pf).

✅ расска́зывать = imperfective, рассказа́ть = perfective.

The -ыва- form is the process/repetition form.

❌ Сейча́с я прочита́ю. (intending 'I'm reading right now')

Wrong — прочита́ть is perfective, so прочита́ю is a future ('I'll read'), not a present.

✅ Сейча́с я чита́ю.

Right now I'm reading. — the imperfective чита́ю is the genuine present.

❌ Assuming говори́ть and сказа́ть are unrelated verbs.

Wrong — they're a single suppletive aspect pair (impf говори́ть / pf сказа́ть), just from different roots.

✅ говори́ть (impf) / сказа́ть (pf) — 'to say', one pair.

Learn suppletive pairs as fixed units.

❌ Reading пры́гнуть as imperfective because -нуть 'looks long'.

Wrong — a -нуть verb is usually a one-shot perfective (semelfactive). пры́гнуть = a single jump (pf); пры́гать = repeated jumping (impf).

✅ пры́гнуть (pf, one jump) vs пры́гать (impf, repeated).

-нуть marks the single instantaneous action.

Key Takeaways

The base / longer-process form is usually imperfective; the perfective adds a prefix (чита́ть → прочита́ть) or sharpens the stem (реша́ть → реши́ть).
A -ыва-/-ива-/-ва-/-а- suffix marks the imperfective, even on a prefixed verb (расска́зывать impf vs рассказа́ть pf) — the strongest single cue.
A -нуть verb is usually a one-shot perfective semelfactive (пры́гнуть); watch for the few stative exceptions (мёрзнуть).
Suppletive pairs (говори́ть / сказа́ть, брать / взять) share no stem and must be memorised.
Dictionaries cite the imperfective first (несов.), then the perfective (сов.).
The payoff: once you spot the perfective, you know its present-shaped form is a future (прочита́ю = "I will read"), while the imperfective's is a true present (чита́ю = "I read / am reading").

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