Choosing moci, umět, znát, or vědět

English bundles a lot of meaning into two short words. "Can" covers both being allowed/able through circumstance and having a learned skill; "know" covers both being acquainted with someone or something and knowing a fact. Czech splits each of these in two, giving four distinct verbs: moci/moct, umět, znát, and vědět. Pick the wrong one and you'll be understood but instantly marked as a learner — Znám plavat ("I'm acquainted with swimming") for "I can swim" is a classic giveaway. This page turns the four-way choice into a quick decision you can run in a fraction of a second.

The four verbs at a glance

The decision tree

Ask yourself, in order:

1. Is it "can" or "know"?
2. If "can": is the ability a learned skill (riding a bike, speaking French)? → umět. Is it a possibility or permission that depends on the situation (Am I free? Am I allowed? Is it physically possible right now)? → moci/moct.
3. If "know": is the object an entity you're acquainted with — a person, a place, a song, a thing? → znát. Is it a fact, a piece of information, usually a that-clause or a who/where/when-clause? → vědět.

moci / moct — possibility and permission

Moci (everyday form moct) means "can" in the sense of the circumstances allow it or I'm permitted to. It is followed by an infinitive. It does not mean a skill — it means the door is open for you to do something. The 1st-person singular můžu (informal) / mohu (formal) is high-frequency.

That last example shows the permission sense — and note the contrast with nesmět ("must not"), the verb for prohibition. For the full conjugation and the modal uses, see moci/moct.

A note on the two forms: moct is the everyday spoken infinitive and moci is its (formal)/(literary) equivalent; both are standard, and the conjugated forms split the same way — můžu, můžeš... are informal, mohu, můžeš... mohou lean formal. Choose by register, not by meaning; they are the same verb.

umět — a learned skill

Umět means "can" / "know how" when the ability was learned and is now stored in you: swimming, cooking, driving, a language, a musical instrument. It takes either an infinitive (umím plavat) or a direct object naming the skill itself (umím česky — literally "I am-able Czech-ly").

The dividing line between umět and moci is whether the obstacle is inside you (you never learned it → umět) or outside you (the situation doesn't permit it → moci). "I can't swim today, the pool is closed" is nemůžu (circumstance). "I can't swim, I never learned" is neumím (skill).

znát — being acquainted with an entity

Znát means "know" in the sense of being familiar/acquainted with a concrete entity: a person, a place, a book, a song, a brand. It takes a noun in the accusative, never a that-clause. If you can replace English "know" with "be familiar with," Czech wants znát.

That last sentence is the perfect illustration of the znát / vědět split inside one breath: you know (are acquainted with) the song — znám — but you don't know (as a fact) its name — nevím. For the paradigm, see znát.

vědět — knowing a fact

Vědět means "know" a piece of information, a fact. It typically introduces a že-clause ("that...") or a wh-clause ("where/who/when/why..."), or stands with the neuter pronoun to ("I know it"). It never takes a person or place as a plain object — that's znát's job.

Watch the irregular present: vím, víš, ví, víme, víte, vědí. The full paradigm is on the vědět page.

There's a subtle overlap worth flagging honestly: znát and vědět can both surface near the word "know about," but they package it differently. Znát takes the thing itself as a direct object (znám ten problém — "I know that problem, I'm familiar with it"); vědět takes information about it (vím o tom problému — "I know about that problem," with the preposition o + locative). When in doubt, test whether you could swap in "I'm acquainted with" (→ znát) or "I'm aware that / I have the information" (→ vědět).

The minimal contrast: umím vs znám vs vím

Run the three through one situation — a foreign language — and the difference is unmistakable:

• Umím anglicky. — "I can speak English." (a learned skill → umět)
• Znám to slovo. — "I know that word." (acquainted with a specific item → znát)
• Vím, co to slovo znamená. — "I know what that word means." (a fact, a wh-clause → vědět)

How this looks to an English speaker

English gives you two verbs where Czech gives four, so the instinct is to grab whichever Czech verb you learned first and use it everywhere. The two classic transfer errors: using znát for a skill (znám plavat instead of umím plavat), because English says "I know how to swim"; and using vědět for a person or place (vím Petra instead of znám Petra), because English says "I know Peter." The fix is to retrain on the object: a person/place/thing after "know" → znát; a fact / that-clause after "know" → vědět; a skill after "can/know how" → umět; a circumstance or permission after "can" → moci/moct.

Common mistakes

Key takeaways

• moci/moct = "can" through circumstance or permission (+ infinitive): Můžu přijít?
• umět = "can / know how" for a learned skill (+ infinitive or a skill-object): Umím plavat, umím česky.
• znát = "know / be familiar with" a person, place, or thing (+ noun): Znám Prahu.
• vědět = "know" a fact (+ že- or wh-clause, or to): Vím, že přijde.
• The reflexes that fix the English merge: skill → umět, circumstance → moci; entity → znát, fact → vědět.