O fogo destruiu o prédio.

Because o is the masculine singular definite article in Portuguese, equivalent to the in English.

• o fogo = the fire
• o prédio = the building

In Portuguese, articles are used more often than in English, so it is very normal to see o/a/os/as before nouns.

Portuguese usually does not need an extra helping verb like English did.

The verb destruiu already carries the tense and the subject information:

• destruir = to destroy
• destruiu = destroyed

So O fogo destruiu o prédio is a complete sentence by itself. Portuguese does not need something like did destroy here.

Destruiu is in the pretérito perfeito (simple past / preterite).

It is used for a completed action in the past.

Examples:

• O fogo destruiu o prédio. = The fire destroyed the building.
• Ela chegou cedo. = She arrived early.
• Eles venderam o carro. = They sold the car.

So here, the destruction is presented as a finished event.

Because destruir is an -ir verb, and in the preterite, the ele/ela/você form is destruiu.

A quick pattern:

• eu destruí
• você/ele/ela destruiu
• nós destruímos
• vocês/eles/elas destruíram

So in this sentence, the subject is o fogo, which is grammatically ele-type, so the verb is destruiu.

Not always. Fogo is the general word for fire, but Portuguese also has incêndio, which often refers more specifically to a fire incident or blaze.

Compare:

• O fogo destruiu o prédio. = The fire destroyed the building.
• O incêndio destruiu o prédio. = The fire / the blaze destroyed the building.

In many situations, both can work, but incêndio can sound a bit more formal or specific when talking about a destructive fire.

Prédio usually means building, especially a constructed urban building such as an apartment building, office building, or similar structure.

In Brazilian Portuguese, prédio very often suggests a sizeable building, especially in a city.

Related words:

• casa = house
• edifício = building / edifice, often more formal
• prédio = building

So o prédio is a very natural way to say the building.

The accent mark in prédio shows the stressed syllable.

It is pronounced roughly PRÉ-dio, with stress on the first syllable.

Without getting too technical, the accent helps show both pronunciation and correct spelling. In Portuguese, accents are important and can distinguish pronunciation and sometimes even meaning.

In Brazilian Portuguese, prédio is approximately:

PREH-jyoo or PREH-dee-oo, depending on accent and how carefully someone speaks.

A few points:

• pré is the stressed part.
• The di before o often sounds a bit like j in many Brazilian accents, especially in careful modern speech: PRÉ-jio.
• The final o in Brazilian Portuguese is often pronounced like u in unstressed position, so it can sound like prédiu.

A practical learner approximation:

• PRÉ-dju or
• PRÉ-diu

In Brazilian Portuguese, destruiu is usually pronounced roughly like:

des-troo-EE-u

The stress is typically on -iu.

A helpful breakdown:

• des-
• tru-
• iu

In normal speech, the last two vowels may glide together a bit, but learners can safely pronounce it clearly as des-tru-iu.

Usually, that would sound unnatural in standard Portuguese.

Portuguese normally uses articles in sentences like this:

• O fogo destruiu o prédio.

Dropping the articles might happen in special contexts like headlines, notes, or very telegraphic language, but in normal speech and writing, you should keep them.

So for a learner, the natural sentence is:

• O fogo destruiu o prédio.

Because the most neutral word order in Portuguese is also subject + verb + object.

So:

• O fogo = subject
• destruiu = verb
• o prédio = object

That makes this sentence very straightforward.

Portuguese can change word order for style or emphasis, but this version is the standard, neutral one.

Yes. That is the passive version:

• O fogo destruiu o prédio. = active
• O prédio foi destruído pelo fogo. = passive

Both are correct, but they focus on different things:

• O fogo destruiu o prédio. focuses on the fire
• O prédio foi destruído pelo fogo. focuses on the building

The active sentence is usually simpler and more direct.

Because verbs agree with the grammatical subject, not with whether the subject is a person.

Here, the subject is o fogo, which is:

• third person
• singular

So the verb must also be third person singular:

• destruiu

Portuguese does this with any singular subject, whether it is a person, thing, idea, or event:

• A chuva começou. = The rain started.
• O carro quebrou. = The car broke down.
• O fogo destruiu o prédio. = The fire destroyed the building.

No. Grammatical gender in Portuguese does not usually mean biological or real-world gender.

Fogo is a masculine noun, so it takes masculine forms:

• o fogo
• um fogo

That is simply a property of the noun in Portuguese. It does not mean fire is male in any literal sense.

The same applies to prédio, which is also masculine:

• o prédio
• um prédio

Not exactly. O fogo specifically means the fire.

If you want to say the flames, the noun is as chamas:

• As chamas destruíram o prédio.

Notice how everything changes to match the new subject:

• as chamas = plural
• destruíram = plural verb form

So o fogo and as chamas are related, but they are not the same.

The infinitive is destruir, meaning to destroy.

Other forms from the same verb:

• destruo = I destroy
• destrói = he/she destroys
• destruiu = he/she destroyed
• destruído = destroyed

Knowing the infinitive helps you recognize and conjugate the verb in other tenses.