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Perfective and imperfective: Polish verb aspect
Almost every Polish verb has a twin. One of the pair describes doing something, the other describes getting it done — and which one you pick changes what tenses are even available to you.
The pair
The imperfective describes the activity: what you were doing, what you do regularly, what was going on. The perfective describes the result: it happened, it is finished, it is done with.
Dictionaries print both, usually imperfective first. Learn them as one item, the way you would learn a noun with its gender — the pair is the unit, not the single verb.
| Imperfective | Perfective | Meaning |
|---|---|---|
| robić | zrobić | to do |
| pisać | napisać | to write |
| czytać | przeczytać | to read |
| jeść | zjeść | to eat |
| kupować | kupić | to buy |
| mówić | powiedzieć | to say |
It decides which tenses you have
This is the part that surprises people. A perfective verb has no present tense — it cannot, because a finished action is not happening now. So the present is always imperfective, and the future has two different shapes depending on which half of the pair you use.
| Tense | Imperfective | Perfective |
|---|---|---|
| present | piszę | — none exists |
| past | pisałem | napisałem |
| future | będę pisać | napiszę |
Będę pisać list.
I will be writing a letter. — activity
Napiszę list.
I will write the letter. — and finish it
How the pairs are built
Most often a prefix makes the imperfective perfective: robić becomes zrobić, pisać becomes napisać, czytać becomes przeczytać. Which prefix is not predictable, and it is why the pair has to be learned together rather than derived.
Sometimes it works the other way: the perfective is the short one and the imperfective is built from it, as in kupić and kupować. And a few pairs are simply two different words — mówić and powiedzieć share no stem at all, exactly as «казати» and «сказати» drift apart in your language.
If you already speak a Slavic language
This whole page describes something you do without thinking. The concept transfers completely; what does not transfer is which prefix Polish chose. Your instinct will be right about *which aspect* to use and wrong about *what it looks like* — so learn the Polish pairs as vocabulary and let the grammar take care of itself.
Mistakes people make
Teraz zrobię obiad. → Teraz robię obiad.
A perfective verb has no present. For what is happening now, the imperfective is the only option.
Będę napisać list. → Będę pisać list. / Napiszę list.
The compound future works only with the imperfective. A perfective future is the simple form: napiszę.
Check yourself
Which is perfective: pisać or napisać?
I am reading a book, right now.
The present is always imperfective.
I will read the whole book.
A finished result in the future: the perfective, in its simple form.
Turn this into something you can actually say.
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Questions people ask
Is Polish aspect the same as in Ukrainian?
The system is the same and transfers almost entirely. What differs is the surface: Polish sometimes picks a different prefix for the same pair, and a handful of verbs pair up differently. Trust your instinct about which aspect a sentence needs; check the dictionary for what the Polish half looks like.
Do I have to learn both halves of every pair?
Yes, and it is less work than it sounds, because the two are usually one prefix apart. Learning only one half leaves you unable to talk about either finishing something or doing it regularly — and those are most sentences.