Na delegacia, a vítima registrou o boletim de ocorrência.

Na is the contraction of em + a.

• em = in / at
• a = the

So:

• na delegacia = in the police station / at the police station

In Portuguese, it is very common to use the definite article with locations like this. Saying em delegacia would sound incomplete or unnatural in this sentence.

Delegacia usually means a police station or police precinct in Brazil.

A few related words:

• delegacia = police station
• delegado = police chief / police commissioner
• polícia = police

So na delegacia means the event took place at the police station.

The comma separates the opening location phrase from the main clause.

• Na delegacia, = At the police station,
• a vítima registrou o boletim de ocorrência. = the victim filed the police report.

This kind of comma is common when a sentence begins with a time, place, or context expression. It helps readability, though in some short sentences Portuguese can be flexible about it.

Portuguese often uses definite articles where English does not.

So:

• a vítima = the victim

Using the article here is completely normal. In Portuguese, nouns like vítima, homem, mulher, polícia, and many others often appear with articles in regular statements.

Grammatically, vítima is a feminine noun, so it takes feminine articles and adjectives:

• a vítima
• a vítima estava nervosa

But it can refer to a person of any sex.

So even if the victim is a man, Portuguese still says:

• a vítima = the victim

If you need to make the person’s sex clear, context or extra words can do that:

• A vítima, um homem de 35 anos, ...
• A vítima, uma mulher de 35 anos, ...

Registrou is the preterite form of registrar.

• infinitive: registrar = to register / to file / to record
• registrou = he/she registered, filed, recorded

In this sentence, it describes a completed past action:

• A vítima registrou o boletim de ocorrência.
• The victim filed the police report.

Literally, registrar can mean to register, to record, or to file, depending on context.

In police/legal contexts, registrar um boletim de ocorrência means to file a police report.

So even though register is the literal-looking English cousin, the most natural translation here is usually:

• file a police report
• sometimes make a police report

Boletim de ocorrência is the standard Brazilian term for a police report or incident report.

Breakdown:

• boletim = report / bulletin
• ocorrência = occurrence / incident

But as a whole, it is a fixed expression. In real usage, Brazilians usually understand it as the official report made to the police.

You will also often hear:

• B.O. = abbreviation of boletim de ocorrência

For example:

• Ela foi à delegacia fazer um B.O.
• She went to the police station to file a police report.

Both are possible in some contexts, but o boletim de ocorrência sounds natural here because it refers to the specific report being filed in that situation.

• o = the
• um = a

With registrar boletim de ocorrência, Portuguese often uses the definite article in a fairly natural, generic-but-specific way, similar to how English might say file the report once the situation is understood.

So this sentence presents the action as a concrete, identifiable event.

Because boletim de ocorrência is a fixed noun expression.

Here, de links the two nouns:

• boletim de ocorrência = report of occurrence / incident report

You do not use da here because the phrase is not talking about one specific already-mentioned occurrence in that structure. It is the established name of the document.

Compare:

• boletim de ocorrência = police report / incident report
• o relato da ocorrência = the account of the incident

In the second example, da ocorrência refers more directly to the incident.

Yes. That is also correct.

Both word orders are natural:

• Na delegacia, a vítima registrou o boletim de ocorrência.
• A vítima registrou o boletim de ocorrência na delegacia.

The difference is mainly focus.

• Starting with Na delegacia highlights the location first.
• Putting na delegacia at the end gives a more neutral flow.

Portuguese allows this kind of flexibility more easily than English in many cases.

In standard Brazilian pronunciation, registrou sounds approximately like:

heh-jis-TROH

A rough breakdown:

• re often sounds like heh at the start of a word in Brazilian Portuguese
• gis has a soft g, like the s in measure or zh
• stress is on the last part: trou

So the stress is:

• re-gis-TROU

Yes, people really say boletim de ocorrência, especially in formal or semi-formal contexts.

But in everyday Brazilian speech, people very often say:

• fazer um B.O.
• registrar um B.O.

Examples:

• Ela foi fazer um B.O.

• She went to file a police report.

• Preciso registrar um B.O.
• I need to file a police report.

So the full term is common, but the abbreviation B.O. is extremely common in speech.

Sometimes yes, depending on context, but it is not always the best direct choice.

In this sentence:

• A vítima registrou o boletim de ocorrência.

The most natural English translation is usually:

• The victim filed the police report.

If you say reported, that can sound more general, like reported the crime rather than specifically filed the official police report.

So:

• registrou o boletim de ocorrência = more specifically filed the police report
• denunciou o crime = reported the crime

Yes, it sounds fairly neutral-to-formal, especially because of a vítima and boletim de ocorrência.

It sounds like something you might see in:

• news reports
• police reports
• formal narration

In more casual speech, people might say something like:

• A vítima foi na delegacia e fez um B.O.

That is more conversational, although foi à delegacia is more standard than foi na delegacia in careful writing.

Because the subject is singular:

• a vítima = the victim = one person

So the verb must also be singular:

• a vítima registrou

If it were plural, it would be:

• as vítimas registraram o boletim de ocorrência
• the victims filed the police report

Yes. Portuguese em often covers both in and at, depending on context.

So na delegacia can naturally be translated as:

• at the police station
• in the police station

In English, at the police station is often the more natural choice here, but the Portuguese does not force a strong distinction.