ptát se / zeptat se — to ask (a question)

"To ask a question" is the reflexive aspect pair ptát se / zeptat se. Both halves carry an obligatory se that is part of the verb — you never use them without it. The imperfective ptát se is asking as a process or a habit ("she keeps asking me," "I always ask"); the perfective zeptat se is one completed question ("I'll ask the teacher"). The challenge for English speakers isn't the conjugation — both are regular Class V (-á-) verbs — but the government: the person you ask goes in the genitive, the topic goes in na + accusative, and the little se has to land in exactly the right spot in the sentence.

The two halves, side by side

Both verbs conjugate like dělat. The only visible difference is the perfective prefix ze- and, of course, the ever-present se.

What the verb governs: genitive person + na + accusative topic

This is the heart of the page. With ptát se / zeptat se, the case marking is counter-intuitive for English speakers:

• The person you ask stands in the genitive — ptát se koho? ("ask whom?").
• The topic you ask about stands in na
  • accusative — ptát se na co? ("ask about what?").

So the full frame is ask [genitive person] na [accusative topic]:

Here učitele is the genitive of učitel ("teacher"), and na úkol is na + accusative ("about the assignment"). Both slots are optional — you can ask without naming the person or the topic — but when they appear, these are the cases. The genitive government puts this verb in the company of other genitive-governing verbs.

In the last sentence, mě is the genitive of já ("me") and na to samé is na + accusative ("about the same thing"), and the imperfective ptáš se signals a repeated, nagging action.

The obligatory clitic se and where it goes

The se is not optional and not movable at will — it's a clitic that wants the second position in the clause (the so-called Wackernagel slot), even when that pulls it far from the verb. It also sits inside a fixed clitic order: a past-tense auxiliary like jsem comes before se.

Look at the order: jsem se ho — auxiliary first, then reflexive se, then the genitive pronoun ho ("him"). The verb ptal comes at the very end. This second-position behaviour is the same one introduced for reflexive se and si: the clitics cluster after the first stressed unit, not next to their verb.

Here se jumps to second position right after na nic ("about nothing"), leaving the verb neptej behind it. If you stick se rigidly next to the verb, your Czech will sound off even when it's understandable.

Asking with a content clause

Very often you don't ask "about" a noun — you ask whether or what or when. Then the topic is a subordinate clause introduced by jestli / zda ("whether"), co ("what"), kdy ("when"), and so on, with no na:

Note the comma before the clause — Czech always sets off subordinate clauses with a comma. The perfective zeptal se reports one finished question; the imperfective ptala se suggests she asked (and perhaps kept asking) without a clear endpoint.

ptát se vs žádat vs prosit — three "asks"

English "ask" hides a distinction Czech makes sharply. ptát se / zeptat se is to ask a question — to seek information. To ask for something — to request or plead — you need a different verb with a different government:

The difference is real and grammaticalized: a question uses ptát se (genitive + na), while a request uses žádat or prosit (accusative + o). Choosing ptát se when you mean "ask for" is a classic transfer error.

The past tense

Both halves form the past from the l-participle plus the auxiliary, agreeing in gender and number, with se in the clitic cluster.

The imperative likewise keeps se: imperfective ptej se / ptejte se, perfective zeptej se / zeptejte se. The perfective zeptej se ("go ask!") is the everyday command for one question.

Common mistakes

The person you ask goes in the genitive (učitele), not the dative (učiteli). The dative would be right for "answer/help someone," but ptát se governs the genitive.

Zeptat se na means "ask about" (a question). For asking for something, use požádat / poprosit o + accusative.

The topic of a question is introduced by na + accusative, not o. (The o belongs to požádat / poprosit, the request verbs.)

Ptát se carries an obligatory se, but its counterpart odpovídat / odpovědět ("to answer") does not — don't copy the reflexive across to it.

Key takeaways

• ptát se = imperfective (repeated/ongoing asking); zeptat se = perfective (one completed question). Both always keep se.
• Government: genitive person
  • na
    • accusative topic — Zeptám se učitele na to.
• The clitic se sits in second position, after a past auxiliary: Včera jsem se ho ptal.
• A question is ptát se (genitive + na); a request is žádat / prosit (accusative + o). Don't confuse the two "asks."
• Perfective zeptám se = "I will ask"; for asking right now or repeatedly, use ptám se.