A oficina reparou o carro.

Yes. A is the feminine singular form of the in Portuguese.

• o = the for masculine singular nouns
• a = the for feminine singular nouns

So:

• a oficina = the workshop / the repair shop
• o carro = the car

Portuguese uses definite articles very often, sometimes more often than English.

Because oficina is a feminine noun in Portuguese. Nouns have grammatical gender, so the article must match:

• a oficina
• not o oficina

This does not mean the workshop is biologically female; it is just a grammatical category.

In Brazilian Portuguese, oficina usually means a workshop, garage, or repair shop, especially a place where vehicles or machines are repaired.

In this sentence, a oficina is the subject, meaning the business or repair shop did the repair.

English also sometimes does this:

• The shop repaired the car
• The garage fixed the car

So the sentence is natural in Portuguese.

Reparou is the preterite form of the verb reparar for ele/ela/você.

• reparar = to repair
• reparou = repaired

In this sentence, the subject is a oficina, which is grammatically singular, so the verb is in the third person singular:

• A oficina reparou...

This tense is used for a completed action in the past.

It is the pretérito perfeito do indicativo, usually called the preterite in English grammar explanations.

It expresses a finished action in the past:

• A oficina reparou o carro. = The workshop repaired the car.

Other examples:

• Ele chegou. = He arrived.
• Nós compramos pão. = We bought bread.

Here, the subject is not a pronoun; it is explicitly stated: A oficina.

So the structure is:

• A oficina = subject
• reparou = verb
• o carro = object

Even when Portuguese drops pronouns like ele or ela, the verb form and context usually help. In this sentence, though, there is no ambiguity because the subject is written out.

Portuguese often uses articles where English might or might not use them. Here, o carro means the car, referring to a specific car.

• A oficina reparou o carro. = The workshop repaired the car.

If you said A oficina reparou carro, that would sound unnatural in standard Portuguese.

Yes, reparar is correct, but consertar is often more common in everyday Brazilian Portuguese when talking about fixing something.

So both can work:

• A oficina reparou o carro.
• A oficina consertou o carro.

In many everyday situations, Brazilians are more likely to say consertou.

A small note:

• reparar can also mean to notice in some contexts, especially in European Portuguese or more formal/literary use, but here the meaning is clearly to repair.

This is the most neutral word order in Portuguese:

subject + verb + object

• A oficina = subject
• reparou = verb
• o carro = object

You can sometimes change the order for emphasis or style, but the basic order is the most common and natural for learners.

For example:

• O carro, a oficina reparou.

This is possible in special contexts, but it is less neutral and sounds marked.

In Brazilian Portuguese, reparou is approximately pronounced like:

heh-pah-ROH

A rough breakdown:

• re = a short sound like heh or reh
• pa = pah
• rou = usually like roh in many Brazilian accents

The stress is on the last syllable: re-pa-ROU

In Portuguese, verbs agree with the subject in person and number, not in grammatical gender.

So:

• singular subject → singular verb
• plural subject → plural verb

Examples:

• A oficina reparou o carro.
• O mecânico reparou o carro.
• As oficinas repararam o carro.

Notice that a oficina and o mecânico both take reparou because both are singular.

No, not in this sentence.

First, oficina means workshop / repair shop, not office.
Second, with o carro as the object and with oficina as the subject, the most natural meaning is clearly repaired.

So here:

• oficina = repair shop
• reparou = repaired

There is no real confusion in context.

If both the shop and the car became plural, you would say:

• As oficinas repararam os carros.

Changes:

• a → as
• oficina → oficinas
• reparou → repararam
• o → os
• carro → carros

This shows agreement in articles, nouns, and the verb.