English uses know for three completely different ideas: knowing a fact ("I know that it's Tuesday"), knowing a person or thing ("I know Anna," "I know Kraków"), and knowing how to do something ("I know how to swim"). Polish keeps these three apart with three different verbs — wiedzieć, znać, and umieć — and the good news is that the choice is almost mechanical: it is decided by what kind of thing follows the verb. Learn to read the complement and the verb picks itself.
The decision rule: look at the complement
A FACT — expressed with a że-clause or a wh-clause → wiedzieć A PERSON / PLACE / THING — a noun object (accusative) → znać A SKILL — expressed with an infinitive → umieć
That is the entire system. Each verb takes a different grammatical complement, so you rarely have to think about meaning at all — you think about form.
| Verb | Means | Government (what follows) | Example |
|---|---|---|---|
| wiedzieć | know a fact / information |
| Wiem, że masz rację. |
| znać | be acquainted with |
| Znam Annę. / Znam Kraków. |
| umieć | know how to / have a skill |
| Umiem pływać. |
wiedzieć — knowing facts (+ a clause)
Wiedzieć is for information you hold in your head. It is almost always followed by a clause: że ("that") for statements, or a question word (gdzie, kto, co, kiedy, dlaczego, jak) for indirect questions.
Wiem, że pociąg ma opóźnienie.
I know that the train is delayed.
Nie wiem, gdzie ona mieszka.
I don't know where she lives.
Wiesz, kto to zrobił?
Do you know who did it?
Note the obligatory comma before że and before the question word — Polish punctuates every subordinate clause this way (see embedded questions).
Wiedzieć can take a bare object only in a few frozen, pronoun-like cases: Wiem to ("I know that"), Nic nie wiem ("I don't know anything"), Wiesz co? ("You know what?"). These work because to / co / nic stand in for a whole proposition — they are still "facts," just compressed.
Wiem to od dawna.
I've known that for a long time.
znać — being acquainted (+ accusative)
Znać means you are familiar with someone or something through experience — a person, a city, a song, a book, a language. It takes a direct object in the accusative, never a clause.
Znasz Marka? Pracuje ze mną.
Do you know Marek? He works with me.
Znam Kraków jak własną kieszeń.
I know Kraków like the back of my hand.
Czy znasz tę piosenkę?
Do you know this song?
A useful diagnostic: if you could replace "know" with "be familiar with" or "be acquainted with," it is znać. You are acquainted with Marek, familiar with Kraków, familiar with the song.
umieć — knowing how (+ infinitive)
Umieć is the "skill" verb: it means you have learned how to do something and can do it. It is followed by an infinitive. (It is one of Polish's modal-type verbs — see moc/umieć/wolno.)
Umiem pływać, ale nie umiem nurkować.
I can swim, but I can't dive.
Moja córka już umie czytać.
My daughter can already read.
Nie umiem gotować, ale się uczę.
I can't cook, but I'm learning.
In speech, umieć often overlaps with móc ("can/be able") and potrafić ("manage to / be capable of"). The distinction: umieć = a learned skill ("know how"); móc = possibility/permission in the moment ("Can I sit here?"). For a trained ability, prefer umieć.
The sorting test
Run any "know" sentence through three questions:
- Does "know" introduce a "that…" / "where…" / "who…" clause? → wiedzieć. ("I know that he's here.")
- Is the object a person, place, or named thing? → znać. ("I know him," "I know Warsaw.")
- Is the object "how to + verb"? → umieć. ("I know how to drive.")
The famous trio, side by side:
Znam go.
I know him (acquainted) — znać + accusative.
Wiem, że jest tutaj.
I know that he's here (a fact) — wiedzieć + clause.
Umiem prowadzić samochód.
I know how to drive a car (a skill) — umieć + infinitive.
Three Englishes all use "know"; three Polishes use three verbs, sorted purely by complement.
The classic "answer" trap
The biggest pitfall hides in the word answer / odpowiedź, because in English "Do you know the answer?" feels factual. But odpowiedź is a noun object, not a clause — so it takes znać, not wiedzieć:
Znasz odpowiedź?
Do you know the answer? — odpowiedź is a noun → znać.
Wiesz, jaka jest odpowiedź?
Do you know what the answer is? — now it's a clause → wiedzieć.
The meaning is nearly identical; the grammar decides the verb. If you front a noun (odpowiedź, numer, adres, nazwisko) use znać; if you unpack it into a clause (jaka jest…, jaki jest…) use wiedzieć.
Znasz jego numer telefonu?
Do you know his phone number?
Nie wiem, jaki jest jego numer.
I don't know what his number is.
Common Mistakes
❌ Wiem odpowiedź.
Incorrect — a bare noun object can't follow wiedzieć.
✅ Znam odpowiedź.
I know the answer.
This is the single most common error. English "I know the answer" looks factual, so learners grab wiem — but odpowiedź is a noun object, which belongs to znać.
❌ Znam, że masz rację.
Incorrect — znać cannot take a że-clause.
✅ Wiem, że masz rację.
I know that you're right.
A że-clause is a fact, so it must be wiedzieć. Reserve znać for noun objects.
❌ Wiem pływać.
Incorrect — a skill (infinitive) doesn't follow wiedzieć.
✅ Umiem pływać.
I know how to swim.
A "how to + verb" skill is always umieć + infinitive. English "know how to" maps to umieć, never wiedzieć.
❌ Czy wiesz Annę?
Incorrect — a person is a noun object, not a fact.
✅ Czy znasz Annę?
Do you know Anna?
People are the textbook case of znać + accusative. Wiedzieć a person is impossible — you can only know facts about her: Wiem, kim jest Anna.
❌ Umiem, że to prawda.
Incorrect — umieć takes a skill, not a fact-clause.
✅ Wiem, że to prawda.
I know that it's true.
Key Takeaways
- The choice is decided by the complement, not the meaning: clause → wiedzieć, noun (accusative) → znać, infinitive → umieć.
- wiedzieć + że/wh-clause = a fact. znać + accusative = a person/place/thing you're acquainted with. umieć + infinitive = a learned skill.
- The "answer" trap: a noun (odpowiedź, numer, adres) takes znać; unpack it into a clause (jaka jest…) and it becomes wiedzieć.
- People are always znać ("I know him" = znam go); you can only wiedzieć facts about them.
- "Know how to" is always umieć
- infinitive.
Now practice Polish
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Start learning Polish→Related Topics
- wiedzieć — to know (a fact)A2 — Full reference for the irregular verb wiedzieć ('to know a fact'): present wiem/wiesz…/wiedzą, past wiedział/wiedziała/wiedzieli/wiedziały, imperative wiedz — and the three-way split wiedzieć vs znać vs umieć.
- znać — to know (be acquainted)A2 — Full conjugation of znać / poznać ('be acquainted with' / 'get to know, meet'): present znam/znasz/zna…/znają, past znał, the meet-phrase Miło mi cię poznać, and the split znać vs wiedzieć vs umieć.
- Ability and Permission: móc, umieć, potrafić, wolno, możnaA2 — Polish splits English 'can' into several words — móc (situational possibility/permission), umieć and potrafić (learned skill), and the impersonal można and wolno — and choosing the right one is the whole game.
- Tricky Verb Pairs: prosić/pytać, grać w/na, znać/wiedziećB1 — English verbs that split into two or three Polish verbs depending on the complement — prosić vs pytać ('ask'), grać w vs na ('play'), znać/wiedzieć/umieć ('know'), uczyć vs uczyć się ('teach/learn').
- mówić / powiedzieć — to say, speak, tellB1 — Full reference for the suppletive pair mówić (impf, 'speak/talk') / powiedzieć (pf, 'say/tell'): present mówię/mówisz…, future powiem/powiesz…/powiedzą (the wiedzieć-stem), imperatives mów / powiedz — and when to use each.
- Indirect (Embedded) QuestionsB1 — How to fold a question inside a bigger sentence: yes/no embedded questions use czy 'whether', wh-embedded questions keep their question word, a comma always precedes the clause — and, unlike English, Polish never reshuffles the word order.