Most Ukrainian verbs start life imperfective (чита́ти, писа́ти, роби́ти), and the language's commonest way to build the perfective partner is to add a prefix: чита́ти → прочита́ти, писа́ти → написа́ти, роби́ти → зроби́ти. When the prefix does nothing but supply completion — no new lexical meaning, the same core sense — it is called a pure (or "empty") perfectivizing prefix, and the result is a genuine aspect pair. This page lists the frequent perfectivizing prefixes, gives a dozen high-value pairs to memorise, and then draws the one line that matters most: the very same prefixes can instead add meaning and make a brand-new verb, which is not an aspect pair (that is the next page).
The idea: a prefix that adds only completion
Take чита́ти "to read". It is imperfective: it names the activity, open-ended. Add про- and you get прочита́ти "to read (through), to finish reading" — perfective. The core meaning is identical (it is still reading); the prefix contributes only the boundary, the getting-to-the-end. That is what makes чита́ти / прочита́ти a clean aspect pair rather than two different verbs.
Я чита́ю цю кни́жку дру́гий ти́ждень — ось‑ось прочита́ю.
I've been reading this book for a second week — I'm about to finish it. (чита́ю imperfective process; прочита́ю perfective completion. Same meaning, plus an endpoint.)
Я весь ра́нок роби́в звіт і наре́шті його́ зроби́в.
I worked on the report all morning and finally got it done. (роби́в imperfective process; зроби́в perfective result. The з- only adds completion.)
The frequent perfectivizing prefixes
There is no single "the" perfectivizing prefix — which prefix pairs with which verb is, to a real degree, lexicalised and must be learned per verb. But a handful do the bulk of the work:
| Prefix | Sample pairs (imperfective → perfective) |
|---|---|
| про- | чита́ти → прочита́ти (read) |
| на- | писа́ти → написа́ти (write); малюва́ти → намалюва́ти (draw) |
| з- / с- / зі- | роби́ти → зроби́ти (do); ї́сти → з’ї́сти (eat up); пекти́ → спекти́ (bake) |
| по- | ба́чити → поба́чити (see); чу́ти → почу́ти (hear); дя́кувати → подя́кувати (thank); диви́тися → подиви́тися (watch) |
| ви- | вчи́ти → ви́вчити (learn); пи́ти → ви́пити (drink) |
| при- | готува́ти → пригото́вити / приготува́ти (prepare) |
| зі- / з- | будува́ти → збудува́ти / побудува́ти (build) |
A note on the spelling of з- / с- / зі-: the prefix is с- before the voiceless consonants к, п, т, ф, х (спекти́, спита́ти), зі- before an awkward cluster (зібра́ти, зігра́ти), and з- elsewhere (зроби́ти). And note the apostrophe in з’ї́сти: the з- prefix before the iotated ї takes an apostrophe (U+2019), exactly as in об’є́днати — never write it without the apostrophe.
Twelve pairs to memorise
These are the highest-frequency pure (or near-pure) prefixal pairs. Learn them as fixed units — the imperfective is the "raw" verb, the perfective its prefixed completion:
| Imperfective | Perfective | Meaning | Prefix |
|---|---|---|---|
| чита́ти | прочита́ти | to read | про- |
| писа́ти | написа́ти | to write | на- |
| роби́ти | зроби́ти | to do / make | з- |
| ї́сти | з’ї́сти | to eat | з- + ’ |
| пи́ти | ви́пити | to drink | ви- |
| вчи́ти | ви́вчити | to learn / memorise | ви- |
| ба́чити | поба́чити | to see | по- |
| чу́ти | почу́ти | to hear | по- |
| диви́тися | подиви́тися | to watch / look | по- |
| дя́кувати | подя́кувати | to thank | по- |
| будува́ти | збудува́ти | to build | з- |
| малюва́ти | намалюва́ти | to draw / paint | на- |
Я ви́пив ка́ву й уже́ збудува́в пів сте́лажа — продукти́вний ра́нок.
I've had my coffee and already built half the shelving — a productive morning. (ви́пив, збудува́в: prefixed perfectives, completed results.)
Подя́куй ба́бусі за пирі́г і не забу́дь поба́чити, чи вона́ ви́спалася.
Thank Grandma for the pie and don't forget to check whether she got enough sleep. (подя́куй, поба́чити: по- perfectives.)
Ти вже ви́вчив вірш? — Ма́йже, ще раз прочита́ю і все.
Have you learned the poem yet? — Almost, I'll read it once more and that's it. (ви́вчив, прочита́ю — perfectives; the bare ви́вчив contrasts with imperfective вчив 'was learning'.)
Note the stress and stem effects
A pure prefix does not always leave the rest of the word untouched. Two things to watch:
- Stress can move onto the prefix, especially with ви-, which is a strong stress-attractor: пи́ти → ви́пити, вчи́ти → ви́вчити, лікува́ти → ви́лікувати. Mark the stress on the prefix, not the root, in these.
- The stem is otherwise unchanged. Pure prefixation does not alter the conjugation pattern: прочита́ти conjugates in the (perfective) future exactly like чита́ти does in the present — прочита́ю, прочита́єш… So once you know the imperfective's pattern, the prefixed perfective inherits it.
Ви́пий води́ й сядь — ти геть бі́лий.
Drink some water and sit down — you're completely pale. (ви́пий: imperative of ви́пити, stress on the prefix ви-.)
The crucial catch: the same prefix can change meaning
Here is the line every learner must draw. The prefixes above are "pure" only with particular verbs. The very same prefixes, on other verbs — or even on the same root — add lexical meaning and create a new verb, with its own separate aspect pair. Compare:
- писа́ти → написа́ти "write (complete)" — pure pair (aspect only).
- писа́ти → переписа́ти "rewrite, copy over" — new verb (пере- = 're-/over'); its imperfective partner is перепи́сувати, not писа́ти.
- писа́ти → записа́ти "write down, record" — new verb (за- here = 'down/in'); imperfective запи́сувати.
Я написа́в твір, по́тім переписа́в його́ на́чисто й записа́в нота́тки на по́лях.
I wrote the essay, then rewrote it as a clean copy, and jotted notes in the margins. (написа́в = pure completion of писа́ти; переписа́в and записа́в are NEW verbs, each with its own imperfective перепи́сувати / запи́сувати.)
So prefixation does two jobs at once in Ukrainian, and you have to tell them apart: with one verb a prefix is purely aspectual (a pair), with another the same prefix is lexical (a new verb). The reliable test is the meaning check from the tip above. The meaning-adding prefixes — пере-, за-, ви-, до-, під-, по- in its 'a bit' sense — are the subject of the prefixes-add-meaning page. The other half of pair-formation — building imperfectives from perfectives by suffix (купи́ти → купува́ти) — is on the suffix-derivation page.
Source-language comparison
For an English speaker, the closest familiar device is the particle/prefix verb: "read" vs "read through", "eat" vs "eat up", "drink" vs "drink up" — the particle adds completion, just as про-/ви-/з- do. The difference is that Ukrainian does this systematically and obligatorily to mark perfective aspect, not occasionally for emphasis, and the choice of prefix is lexicalised per verb — there is no rule that predicts про- for "read" but на- for "write". You memorise the pair. The good news: the prefixed perfective conjugates exactly like its base verb, so you get its whole paradigm for free.
For a Russian speaker, prefixal pair-formation works the same way, and many pairs coincide (прочита́ти, написа́ти, зроби́ти). Watch the spots where Ukrainian's chosen prefix or stem differs, and mind Ukrainian orthography — the apostrophe in з’ї́сти, the с-/зі-/з- alternation — which Russian spells differently.
Common Mistakes
❌ Я бу́ду прочита́ти кни́жку. (бу́ду + a prefixed perfective)
Wrong — a prefixed perfective is still perfective, so it can't take the бу́ду-future. Use the one-word future: Я прочита́ю кни́жку.
✅ Я прочита́ю кни́жку.
I'll read the book (through). (One-word perfective future.)
❌ Я зїв уве́сь торт. (з + ї with no apostrophe)
Misspelt — the prefix з- before ї takes an apostrophe: Я з’їв уве́сь торт.
✅ Я з’їв уве́сь торт.
I ate the whole cake. (з’ї́сти, with the apostrophe U+2019.)
❌ Я переписа́в листа́ за п’ять хвили́н. (treating переписа́ти as the plain perfective of писа́ти)
Meaning slip — переписа́ти means 'REwrite / copy over', a new verb. The plain perfective of писа́ти 'write' is написа́ти: Я написа́в листа́ за п’ять хвили́н.
✅ Я написа́в листа́ за п’ять хвили́н.
I wrote the letter in five minutes. (написа́ти = pure perfective of писа́ти.)
❌ Вони́ построї́ли дім. (Russian-style 'построить')
Not standard Ukrainian — the pair is будува́ти → збудува́ти / побудува́ти: Вони́ збудува́ли дім.
✅ Вони́ збудува́ли дім.
They built a house. (збудува́ти, the standard perfective.)
Key Takeaways
- The commonest way to make a perfective is to add a prefix to the imperfective; when the prefix adds only completion, you get a true aspect pair.
- High-frequency perfectivizing prefixes: про- (прочита́ти), на- (написа́ти), з-/с-/зі- (зроби́ти, з’ї́сти, спекти́, збудува́ти), по- (поба́чити, почу́ти, подя́кувати), ви- (ви́вчити, ви́пити), при- (приготува́ти).
- Which prefix pairs with which verb is lexicalised — memorise the pair. Watch stress moving onto ви- (ви́пити), and the apostrophe in з’ї́сти.
- The decisive caveat: the same prefixes can add meaning and make a new verb (писа́ти → переписа́ти 'rewrite', записа́ти 'write down') — not an aspect pair. Always run the meaning check.
- The complementary mechanism — making imperfectives from perfectives by suffix — is on the suffix-and-stems page.
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Start learning Ukrainian→Related Topics
- Verbal Aspect: The Big PictureA2 — Aspect is the central, pervasive feature of the Ukrainian verb: nearly every verb belongs to an aspect PAIR — imperfective (недоко́наний вид), which views an action as a process, ongoing, repeated, or general (чита́ти), and perfective (доко́наний вид), which views it as a single completed whole with a result or boundary (прочита́ти). The consequences are sharp: imperfectives have a present, a past, and BOTH futures (бу́ду чита́ти / чита́тиму); perfectives have NO present — their present-shaped form is future (прочита́ю = 'I will read it through') — only a past (прочита́в) and a simple future (прочита́ю). Aspect is chosen for EVERY verb in EVERY clause; it is not optional, and it has no English equivalent.
- Forming Aspect Pairs: Suffixes and StemsB1 — The other half of the pairing system: deriving an IMPERFECTIVE from a perfective by suffix, above all the -а-/-ува-/-ову- imperfectivizing suffixes — да́ти→дава́ти, купи́ти→купува́ти, показа́ти→пока́зувати, забу́ти→забува́ти, відкри́ти→відкрива́ти. Plus consonant mutations (зустрі́ти→зустріча́ти), root-vowel alternations (зібра́ти→збира́ти, поме́рти→помира́ти), and the handful of suppletive pairs that must simply be memorised (бра́ти/взя́ти, говори́ти/сказа́ти).
- When Prefixes Change Meaning (Aktionsart)B1 — Beyond pure perfectivizing, prefixes ADD lexical meaning and build whole verb families from one root: писа́ти → написа́ти, переписа́ти, записа́ти, підписа́ти, дописа́ти, ви́писати, розписа́ти, приписа́ти. Learn the prefix meanings — за- 'begin', по- 'a bit/a while', пере- 're-/over', до- 'finish off', ви- 'out', при- 'arrive' — and you unlock new verbs by the dozen. Each new verb is its OWN lexeme with its OWN aspect pair, not a pair with the bare root.
- Choosing the Right Perfectivizing PrefixB2 — Which 'empty' prefix turns a given imperfective into its perfective partner is lexically fixed and unpredictable: чита́ти→ПРОчита́ти, писа́ти→НАписа́ти, роби́ти→ЗРОби́ти, ї́сти→З’ї́сти, пи́ти→ВИ́пити, ба́чити→ПОба́чити, чу́ти→ПОчу́ти, буди́ти→РОЗбуди́ти. There is no rule — pick the wrong prefix and you get a DIFFERENT verb. The only strategy is to memorise each aspect pair as a unit.
- Читати / Прочитати (to read)A1 — Complete conjugation-and-usage reference for the model regular aspect pair чита́ти (imperfective) / прочита́ти (perfective) 'to read'. This is the cleanest pair in the language for anchoring the whole aspect system: imperfective чита́ти conjugates as a textbook first-conjugation -ай- verb (чита́ю, чита́єш, чита́є…), and the perfective прочита́ти conjugates identically but means the FUTURE (прочита́ю = 'I will read [it through]', never 'I read'). Covers past чита́в / прочита́в, the synthetic future чита́тиму, the imperative чита́й, and the accusative object.
- Робити / Зробити (to do / make)A1 — Complete conjugation-and-usage reference for роби́ти / зроби́ти 'to do, to make' — a second-conjugation verb with the labial л-insertion in the 1sg роблю́ AND the 3pl ро́блять (but ро́биш, ро́бить, ро́бимо, ро́бите between them), and the stress retracting to the stem after роблю́. Covers the gendered past, both imperfective futures, the imperative роби́, the model aspect pair роби́ти / зроби́ти (зроблю́ = future), the everyday question Що ти ро́биш? 'what are you doing?', the accusative object, and the rich prefix family (переробля́ти, доробля́ти, заробля́ти).