Na služebně jsem nahlásil krádež.

In this sentence, na služebně means at the station/office, most naturally at the police station in this context.

The noun služebna is a place where an official service operates, and in everyday Czech, policejní služebna is a police station. Because the sentence is about reporting a theft, Czech speakers will usually understand na služebně as at the police station, even without policejní being said explicitly.

So:

• služebna = station/office/post
• na služebně = at the station

This is mainly a matter of Czech usage and collocation.

Czech often uses na with certain public institutions, workplaces, and offices where English would use in or at. So na služebně is the natural idiomatic expression.

A learner often wants to map:

• na = on
• v = in

But that does not always work in Czech. With locations, prepositions are often fixed by usage.

For example, Czech commonly says:

• na policii = at the police
• na poště = at the post office
• na úřadě = at the office / authority office
• na služebně = at the station

So here, na služebně is just the normal way to say it.

služebně is in the locative singular.

That is because the preposition na can take different cases depending on meaning:

• na + accusative often expresses movement toward a place
• na + locative often expresses location at a place

Here the meaning is location: at the station, not motion to the station, so Czech uses the locative:

• služebna → base form
• na služebně → locative singular

This is the normal Czech past tense.

Czech past tense is built from:

1. a past participle
2. a form of být (to be) as an auxiliary

Here:

• nahlásil = masculine singular past participle
• jsem = I am/have auxiliary used for past tense

Together:

• jsem nahlásil = I reported

Czech past tense reflects the gender of the speaker in the participle:

• nahlásil jsem / jsem nahlásil = said by a man
• nahlásila jsem / jsem nahlásila = said by a woman

So the sentence as written suggests the speaker is male.

Because Czech usually drops subject pronouns when they are not needed.

The form jsem already shows that the subject is I, so já is unnecessary in a neutral sentence.

So Czech normally says:

• Na služebně jsem nahlásil krádež.

If you add já, it gives extra emphasis or contrast:

• Já jsem nahlásil krádež. = I reported the theft (maybe not someone else)

English normally needs I, but Czech often does not.

Yes. Both are possible.

Czech word order is more flexible than English, and both of these are natural:

• Na služebně jsem nahlásil krádež.
• Na služebně nahlásil jsem krádež. — possible, but less natural in everyday speech
• Na služebně jsem krádež nahlásil.
• Krádež jsem nahlásil na služebně.

The most natural version here is the original one:

• Na služebně jsem nahlásil krádež.

Also, Czech has a tendency for short unstressed words like jsem to come early in the clause, often in the second position, which is why jsem appears where it does.

Nahlásit means to report, to notify officially, or to declare to an authority/system.

In this sentence it means reporting a theft to the police.

It often implies giving information to some official body, institution, or responsible person.

Examples:

• nahlásit krádež = report a theft
• nahlásit ztrátu = report a loss
• nahlásit problém = report a problem
• nahlásit změnu adresy = report a change of address

So it is a very useful verb for formal or official situations.

Because nahlásit is the more suitable verb for reporting something officially, especially as a completed action.

Very roughly:

• hlásit = to announce, report, declare, call out, signal
• nahlásit = to report/notify officially, often to an authority or system

In this context, nahlásit krádež is the standard expression for report a theft.

Also, nahlásit is perfective, which fits a single completed act:

• I reported it

Its imperfective partner is often nahlašovat:

• nahlašovat = to be reporting / to report repeatedly

So the sentence focuses on one completed event, which is why nahlásil fits well.

Krádež is in the accusative singular, because it is the direct object of nahlásil.

The tricky part is that for this noun, the accusative singular looks the same as the nominative singular.

So:

• nominative: krádež = theft
• accusative: krádež = theft

This is normal for many feminine nouns, especially certain consonant-stem patterns.

So even though the form does not visibly change, its grammatical role does:

• krádež here is what was reported

No. They are related, but not the same.

• krádež = theft, stealing
• loupež = robbery

The difference is like in English:

• theft does not necessarily involve force
• robbery involves taking something by force or threat

So if someone stole a bike when nobody was around, krádež is right. If someone threatened a person and took their wallet, that is loupež.

In this sentence, krádež means theft.

It can mean either, depending on context.

Czech has no articles like a and the, so krádež by itself does not tell you whether English should use a or the.

So:

• nahlásil jsem krádež could be I reported a theft
• or I reported the theft

The correct English choice depends on the situation:

• if it is being mentioned for the first time: a theft
• if both speaker and listener already know which theft: the theft

That is something Czech leaves to context.

Yes. The sentence naturally includes the idea at the station, and putting Na služebně first gives that location some prominence.

So the sentence can answer a question like:

• Kde jsi nahlásil krádež? = Where did you report the theft?

Then:

• Na služebně jsem nahlásil krádež. = I reported the theft at the station.

But even without special emphasis, it is just a normal, natural sentence meaning that the reporting took place there.

The past participle would change to feminine:

• Na služebně jsem nahlásila krádež.

That is because Czech past tense agrees with the speaker’s gender in the singular.

So:

• male speaker: nahlásil
• female speaker: nahlásila

Everything else stays the same.