Na delegacia, eu pedi o boletim de ocorrência.

Na is a contraction of em + a.

• em = in / at / on
• a = the feminine singular definite article the

So:

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

In this sentence, Na delegacia gives the setting first, like At the police station, ...

Delegacia usually means police station or police precinct in Brazilian Portuguese.

So:

• na delegacia = at the police station
• na polícia would usually sound more like in the police force / with the police, not specifically the building

If you want to talk about the place where you go to report a crime, delegacia is the natural word.

Pedi is the preterite form of the verb pedir (to ask for / to request).

• eu pedi = I asked for / I requested

The preterite is used for a completed action in the past. So this sentence describes one finished event: you went to the police station and requested the report.

Compare:

• eu pedi = I asked for it / I requested it
• eu pedia = I was asking for it / I used to ask for it

Yes, you could.

Portuguese often drops subject pronouns when the verb already makes the subject clear.

• eu pedi
• pedi

Both can mean I asked for / I requested.

Including eu can add:

• emphasis
• clarity
• contrast

For example, eu pedi might sound a little more explicit, like I was the one who asked for it.

O means the, while um means a / an.

• o boletim de ocorrência = the police report
• um boletim de ocorrência = a police report

Using o suggests a specific report is being referred to. In real situations, Portuguese often uses the definite article where English might be less strict.

So pedi o boletim de ocorrência sounds natural when talking about the report connected to the incident.

Boletim de ocorrência is a standard Brazilian Portuguese expression for a police report or incident report.

Literally, it breaks down as:

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

But you should learn boletim de ocorrência as a whole expression, because that is the normal term used in Brazil.

You may also see it abbreviated as B.O.

Here, de links the two nouns.

• boletim = report
• ocorrência = incident / occurrence

So boletim de ocorrência literally means something like report of an occurrence/incident.

This kind of noun + de + noun structure is very common in Portuguese, for example:

• copo de água = glass of water
• fim de semana = weekend
• sala de aula = classroom

Because pedir normally takes a direct object when you ask for a thing.

So:

• pedi o boletim = I asked for the report

No extra preposition is needed before o boletim.

A useful pattern is:

• pedir algo = to ask for something
• pedir algo a alguém = to ask someone for something

Examples:

• Pedi ajuda. = I asked for help.
• Pedi informação ao policial. = I asked the police officer for information.

So in your sentence, o boletim de ocorrência is simply the thing being requested.

It is natural and correct here, because Na delegacia is an introductory phrase giving the location.

• Na delegacia, eu pedi o boletim de ocorrência.

The comma helps separate the setting from the main clause.

In informal writing, some people might leave it out:

• Na delegacia eu pedi o boletim de ocorrência.

That is still understandable, but the comma is a good standard choice.

Yes. Portuguese allows some flexibility in word order.

These are all possible:

• Na delegacia, eu pedi o boletim de ocorrência.
• Eu pedi o boletim de ocorrência na delegacia.
• Pedi o boletim de ocorrência na delegacia.

They all express basically the same idea, but the emphasis changes a little.

• Starting with Na delegacia highlights the place first.
• Starting with Eu highlights the subject.
• Starting with Pedi can sound a bit more direct or narrative.

A few points help here:

• The stress falls on rên: o-co-RRÊN-ci-a
• The double rr in Brazilian Portuguese is usually pronounced like a strong h sound in many accents
• The ê shows a stressed vowel sound

A rough English-style approximation is:

• oh-koh-HEHN-see-ah

That is only an approximation, but it may help you get started.

Not exactly.

Grammatically, pedi o boletim de ocorrência means I asked for/requested the police report.

But in real-life situations, meanings can overlap depending on context, because people sometimes talk loosely about dealing with the report at the police station.

Still, if you specifically want to say I filed a police report, more natural options might be:

• Registrei um boletim de ocorrência.
• Fiz um boletim de ocorrência. (common in everyday Brazilian Portuguese)

So your sentence is specifically about requesting the report, not necessarily filing it.