Kupować / kupić ("to buy") is the verb you reach for every time you shop, and it is one of the cleanest aspect pairs in Polish: imperfective kupować for habitual or ongoing buying, perfective kupić for a single completed purchase. It also teaches one of the most useful conjugation predictions in the whole language — the -ować → -uję rule. The infinitive kupować ends in -ować, and like every verb of that large class it forms its present not with -owa- but with -uj-: kupuję, not the tempting but wrong kupowam. Master this pair and you simultaneously master a productive pattern that covers hundreds of verbs.
The aspect pair at a glance
The two members differ only in how the buying is viewed, not in what is bought.
| Imperfective | Perfective | |
|---|---|---|
| Infinitive | kupować | kupić |
| Present meaning | kupuję = I buy / am buying | — (no present) |
| Future | będę kupować (compound) | kupię (simple) |
| Conjugation class | -ę / -esz (-uję type) | -ę / -isz |
Note the pair is built by suffixation, not prefixing: the perfective kupić is the bare, short member, and the imperfective kupować lengthens it with the -owa- suffix. This is the reverse of pairs like robić → zrobić, and a reminder that there is no single mechanical recipe for forming aspect — you learn each pair.
Co tydzień kupuję pieczywo w tej samej piekarni.
Every week I buy bread at the same bakery. (habit → imperfective)
Wczoraj kupiłem nowy telefon, bo stary mi padł.
Yesterday I bought a new phone, because my old one died. (single event → perfective)
Present tense (imperfective kupować)
Only the imperfective has a present tense. The stem is kupuj- — this is the whole point of the -ować class.
| Person | Form | Meaning |
|---|---|---|
| ja | kupuję | I buy / I'm buying |
| ty | kupujesz | you buy / you're buying |
| on / ona / ono | kupuje | he / she / it buys |
| my | kupujemy | we buy / we're buying |
| wy | kupujecie | you buy / you're buying (pl) |
| oni / one | kupują | they buy / they're buying |
The row is framed by the nasals kupuję (1sg, -ę) and kupują (3pl, -ą) — easy to confuse in writing, so watch the diacritic. Because Polish has no separate continuous tense, kupuję covers both "I buy" and "I am buying."
Zwykle kupuję warzywa na targu, są świeższe niż w sklepie.
I usually buy vegetables at the market, they're fresher than in the shop.
Dlaczego ciągle kupujesz takie drogie kawy na wynos?
Why do you keep buying such expensive coffees to go?
Perfective future (kupić)
The perfective kupić has no present. Its present-looking forms are already future in meaning — a single completed purchase that will happen. Kupić is an -ę / -isz verb.
| Person | Form | Meaning |
|---|---|---|
| ja | kupię | I'll buy |
| ty | kupisz | you'll buy |
| on / ona / ono | kupi | he / she / it will buy |
| my | kupimy | we'll buy |
| wy | kupicie | you'll buy (pl) |
| oni / one | kupią | they'll buy |
The imperfective future, by contrast, is compound: będę kupować / będę kupował(a) ("I'll be buying," repeatedly or as a process). So Kupię chleb = "I'll buy (a/the) bread" (one act, done), while Będę kupował chleb w tej piekarni = "I'll be buying my bread at this bakery (from now on)."
Jutro kupię ci ten prezent, obiecuję.
I'll buy you that present tomorrow, I promise. (single future act)
Od teraz będę kupować tylko polskie jabłka.
From now on I'll buy only Polish apples. (ongoing habit)
Past tense
Both members take the same gendered past endings; only the stem differs (kupowa- vs kupi-). The aspect contrast lives here too.
| kupować (impf) | kupić (pf) | |
|---|---|---|
| ja (m / f) | kupowałem / kupowałam | kupiłem / kupiłam |
| ty (m / f) | kupowałeś / kupowałaś | kupiłeś / kupiłaś |
| on / ona / ono | kupował / kupowała / kupowało | kupił / kupiła / kupiło |
| my (m-pers. / other) | kupowaliśmy / kupowałyśmy | kupiliśmy / kupiłyśmy |
| wy (m-pers. / other) | kupowaliście / kupowałyście | kupiliście / kupiłyście |
| oni / one | kupowali / kupowały | kupili / kupiły |
Kupowałem ten chleb co rano = "I used to buy this bread every morning" (repeated, no single endpoint). Kupiłem chleb = "I bought (and got) the bread" — one completed result. The masculine-personal plural kupowali / kupili (men or mixed groups) versus kupowały / kupiły (everything else) is the standard Polish plural split.
Babcia zawsze kupowała nam lody po szkole.
Grandma always used to buy us ice cream after school.
Kupiliśmy już bilety, więc nie ma odwrotu.
We've already bought the tickets, so there's no turning back.
Imperative
Built on the present/future stem. The imperfective imperative comes from kupuj- → kupuj; the perfective drops the -ić and softens to kup (a bare consonant). Aspect matters: Kupuj lokalnie ("Keep buying local," a standing policy) vs Kup mleko ("Buy [the] milk," one specific errand).
| Person | kupować (impf) | kupić (pf) |
|---|---|---|
| ty | kupuj | kup |
| my | kupujmy | kupmy |
| wy | kupujcie | kupcie |
| 3rd (niech) | niech kupuje | niech kupi |
Kup mi przy okazji znaczki na poczcie.
Buy me some stamps at the post office while you're at it.
Nie kupuj nic na kredyt, lepiej poczekaj.
Don't buy anything on credit, better wait. (process → imperfective in negation)
Conditional
The conditional adds the movable particle -by plus the past-tense endings, agreeing in gender. Imperfective kupowałbym / kupowałabym ("I would buy / would be buying"); perfective kupiłbym / kupiłabym ("I would buy [and get]").
Kupiłbym ten samochód, gdybym miał więcej pieniędzy.
I would buy that car if I had more money. (masc. speaker)
Kupiłabym to mieszkanie od ręki, ale jest za drogie.
I'd buy this flat on the spot, but it's too expensive. (fem. speaker)
Participles
The contemporary adverbial participle (imperfective only) is kupując ("while buying"): Kupując bilety, sprawdź godzinę odjazdu ("When buying tickets, check the departure time"). The passive participles are kupowany (impf, "being bought") and kupiony (pf, "bought") — note the p → pi softening in kupiony. They decline like adjectives: świeżo kupiony samochód ("a freshly bought car"), kupione w promocji ("bought on sale").
Świeżo kupiony chleb pachnie najlepiej.
Freshly bought bread smells the best.
Government and collocations
Kupować / kupić takes a direct object in the accusative (kupić bilet, kupować ubrania). The person you buy for goes in the dative (kupić komuś prezent = "buy someone a present"). Two further patterns are worth memorising:
- Partitive genitive for an unspecified quantity — "some": kup mleka ("buy some milk"), kupić chleba ("buy some bread"). Compare kup mleko (the milk, a definite item) with kup mleka (some milk). See the partitive genitive.
- kupić coś za
- accusative for the price paid: kupiłem to za sto złotych ("I bought it for a hundred zlotys").
- kupić coś u
- genitive for the seller: kupić u sąsiada ("buy from the neighbour").
| Polish | English |
|---|---|
| kupić bilet | to buy a ticket |
| kupować na raty | to buy in instalments |
| kupić coś w promocji / na wyprzedaży | to buy something on sale |
| kupić kota w worku | to buy a pig in a poke (lit. a cat in a sack) |
| kupić komuś prezent | to buy someone a present |
The opposite of kupować / kupić is the parallel pair sprzedawać / sprzedać ("to sell"), which behaves the same way aspectually.
Kupiłem to za grosze na wyprzedaży.
I bought it for next to nothing on sale.
Kupując mieszkanie online, możesz kupić kota w worku.
Buying a flat online, you can end up buying a pig in a poke.
Common mistakes
❌ Co dzień kupowam świeże bułki.
Incorrect — -ować verbs don't keep -owa- in the present.
✅ Co dzień kupuję świeże bułki.
I buy fresh rolls every day.
❌ Będę kupić nowy laptop w przyszłym tygodniu.
Incorrect — a perfective can't take the compound future; its present form is already future.
✅ Kupię nowy laptop w przyszłym tygodniu.
I'll buy a new laptop next week.
❌ Wczoraj kupowałem telefon i już go używam.
Mismatch — a finished purchase needs the perfective past.
✅ Wczoraj kupiłem telefon i już go używam.
Yesterday I bought a phone and I'm already using it.
❌ Kup dla mnie chleb.
Incorrect — 'buy me' uses the bare dative, not dla + genitive.
✅ Kup mi chleb.
Buy me (some) bread.
❌ Kup trochę mleko do kawy.
Incorrect — 'some milk' is the partitive genitive (mleka), not the accusative mleko.
✅ Kup trochę mleka do kawy.
Buy some milk for the coffee. (partitive genitive)
Key takeaways
- Kupować (impf) / kupić (pf) is a suffix pair — the short member is perfective.
- Present (imperfective only): kupuję, kupujesz, kupuje, kupujemy, kupujecie, kupują — the -ować → -uję class.
- Perfective future is the simple form: kupię, kupisz, kupi, kupimy, kupicie, kupią.
- Past: kupowałem (habit / process) vs kupiłem (one completed purchase).
- Imperative: kupuj (impf) / kup (pf); passive participles kupowany / kupiony.
- Object in the accusative; partitive genitive for "some" (kup mleka); beneficiary in the dative (kup mi).
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