Zaparkoval jsem u pošty.

It is the past tense of the verb zaparkovat = to park / to park something or oneself in the sense of successfully parking / completing the parking action.

• zaparkoval = past participle, masculine singular
• jsem = I am, used here as the auxiliary that helps form the past tense

So zaparkoval jsem literally corresponds to I parked.

If the speaker is female, it would be:

• Zaparkovala jsem = I parked

In Czech, the subject pronoun is often left out because the verb form already shows who is doing the action.

• jsem tells you it is I
• so já is not necessary

You could say:

• Já jsem zaparkoval u pošty.

But this usually adds emphasis, such as:

• I parked by the post office
• It was me who parked there

So the normal neutral version is simply:

• Zaparkoval jsem u pošty.

In normal Czech past tense, the auxiliary jsem usually comes in the second position of the clause, while the main past form often comes first.

So:

• Zaparkoval jsem u pošty. = natural
• Jsem zaparkoval u pošty. = not normal standard word order

This is part of a broader Czech pattern where short words like jsem, jsi, se, si often behave like clitics and prefer the second position in the sentence or clause.

Because the preposition u requires the genitive case.

The dictionary form is:

• pošta = post office

After u, it changes to the genitive singular:

• pošty

So:

• u pošty = by the post office, at the post office, near the post office

This is a very common pattern:

• u domu = by the house
• u školy = by the school
• u stanice = by the station

The preposition u usually means something like:

• by
• near
• at
• next to

In Zaparkoval jsem u pošty, it means the person parked by / near the post office.

It does not usually mean inside the post office area in a strict sense. It is more about location in the vicinity.

Depending on context, English could translate it as:

• I parked by the post office.
• I parked near the post office.
• I parked at the post office.

This is about aspect, which is very important in Czech verbs.

• parkovat = imperfective
• zaparkovat = perfective

parkovat focuses on the process, repetition, or general activity of parking. zaparkovat focuses on the action as completed.

So in this sentence:

• Zaparkoval jsem u pošty. = I parked by the post office / I managed to park there

This is natural because the sentence describes a completed event.

Compare:

• Parkoval jsem u pošty.
  This could mean I was parking by the post office, I used to park by the post office, or in some contexts I was parked by the post office, depending on context.

For a simple finished action, zaparkoval jsem is the better choice.

Yes. In the past tense, Czech past participles agree with the subject in gender and number.

• Zaparkoval jsem = I parked (speaker is male)
• Zaparkovala jsem = I parked (speaker is female)

For plural:

• Zaparkovali jsme = we parked (masculine personal or mixed group)
• Zaparkovaly jsme = we parked (all-female or non-masculine personal group, depending on context)

So the sentence as written suggests a male speaker.

A rough pronunciation guide:

• pošty sounds approximately like posh-ti, but with a Czech ť-like softness before the final y sound area depending on careful pronunciation and speaker
• š is like English sh in shoe
• ť is a soft t sound that English does not have exactly

A practical approximation for English speakers:

• u pošty ≈ oo POSH-tee

Also:

• u is pronounced like oo
• stress in Czech is usually on the first syllable, so:
  • ZAparkoval
  • POšty

Not usually in normal English.

Czech past tense like zaparkoval jsem often corresponds to the English simple past:

• I parked by the post office

English I have parked is present perfect, which is used differently and usually sounds less natural in this context unless there is a special reason.

So the best normal translation is:

• I parked by the post office.

Yes, Czech word order is flexible, but changes in order often affect emphasis or style.

Neutral order:

• Zaparkoval jsem u pošty.

Other possible orders:

• U pošty jsem zaparkoval.
  Emphasizes by the post office

• Já jsem zaparkoval u pošty.
  Emphasizes I

• Zaparkoval jsem jsem is impossible, and Jsem zaparkoval u pošty is not the normal standard order

So while Czech allows movement of words more freely than English, not every order is equally natural.

It can mean both, depending on context.

• pošta = post office as a place
• pošta = mail / postal service / post

In this sentence, because of u pošty, it clearly refers to the post office as a location:

• by the post office

So here it is understood as the building or place, not the institution in an abstract sense.