Eu costumo revisar o relatório antes da reunião.

Because eu is optional, but it can be included for clarity, emphasis, or natural rhythm.

In Brazilian Portuguese, you could say either:

• Eu costumo revisar o relatório antes da reunião.
• Costumo revisar o relatório antes da reunião.

Both are natural. Portuguese often leaves out the subject pronoun when the verb already makes the subject clear. Here, costumo clearly shows I.

Costumo comes from the verb costumar, which is used to express habit or something you usually do.

So:

• eu costumo = I usually
• eu costumo revisar = I usually review

A very common pattern is:

• costumar + infinitive

Examples:

• Costumo acordar cedo. = I usually wake up early.
• Ela costuma estudar à noite. = She usually studies at night.

Because after costumar, the next verb stays in the infinitive.

So the structure is:

• costumar + infinitive

Correct:

• Eu costumo revisar
• Ela costuma ler
• Nós costumamos sair cedo

Not correct:

• Eu costumo reviso
• Ela costuma lê

This is similar to English I usually review, except Portuguese expresses that idea with a conjugated verb plus an infinitive.

It can be similar, but the usage is not always exactly the same as in English.

In this sentence, revisar o relatório means something like:

• to review the report
• to check the report
• to go over the report

With documents, revisar is very natural.

One useful note: English revise can sometimes mean study again for an exam, especially in British English. In Portuguese, that idea is often expressed with verbs like:

• rever
• estudar
• revisar, depending on context

So revisar is a good match here, but it is not always a perfect one-to-one translation in every context.

Portuguese uses definite articles more often than English.

Here, o relatório means the report. That article is very natural and expected.

Portuguese often uses articles with nouns where English might or might not use them, depending on context. In this sentence, it sounds most natural because it suggests a specific report the speaker normally reviews before the meeting.

Da is a contraction of:

• de + a = da

So:

• antes da reunião literally contains de
• reunião is a feminine noun, so it takes a
• together: de + a reunião = da reunião

This kind of contraction is extremely common in Portuguese.

Other common ones:

• de + o = do
• em + a = na
• em + o = no

Because antes normally requires the preposition de.

So the pattern is:

• antes de + noun
• antes de + infinitive

Examples:

• antes da reunião = before the meeting
• antes do almoço = before lunch
• antes de sair = before leaving

So antes a reunião is not correct here.

Because a reunião is understood as a specific meeting, not just the general idea of meetings.

So:

• antes da reunião = before the meeting

If you remove the article, it becomes less natural in this context. Portuguese often uses the article when referring to a specific event already known in the situation.

Reunião is a feminine noun, so it takes the feminine article a.

That is why you get:

• a reunião
• da reunião = de + a reunião

Its gender is grammatical, so it simply has to be learned with the noun:

• o relatório
• a reunião

A good habit is to learn nouns together with their article.

Yes, that is also possible.

Compare:

• Eu costumo revisar o relatório antes da reunião.
• Geralmente reviso o relatório antes da reunião.

Both express habit, but there is a slight difference in feel:

• costumar + infinitive emphasizes something as a usual habit
• geralmente is an adverb meaning generally / usually

Both are natural. Costumar is very common in spoken and written Portuguese.

Yes, but the original order is the most neutral and natural.

Original:

• Eu costumo revisar o relatório antes da reunião.

Possible variations:

• Antes da reunião, eu costumo revisar o relatório.
• Costumo revisar o relatório antes da reunião.

These all work, but moving antes da reunião to the front gives it a bit more emphasis.

It is mostly regular in meaning and usage, but its present-tense forms have a small spelling change to preserve pronunciation.

Present tense:

• eu costumo
• você / ele / ela costuma
• nós costumamos
• vocês / eles / elas costumam

The u appears in forms like costumo and costumam to keep the hard c sound before o and a.

It would sound perfectly natural:

• Costumo revisar o relatório antes da reunião.

In Brazilian Portuguese, this is a very normal way to speak. Adding eu makes the subject more explicit, but it is not required here.

Yes. That is a very common pattern.

With a noun:

• antes da reunião = before the meeting

With a verb:

• antes de revisar o relatório = before reviewing the report
• antes de sair = before leaving

So antes de works with both nouns and infinitives. In your sentence, it is followed by a noun phrase: a reunião.

The conjugated verb is costumo, and the infinitive is revisar.

So the structure is:

• Eu = subject
• costumo = conjugated verb
• revisar = infinitive
• o relatório = direct object
• antes da reunião = time expression

This is a very common Portuguese pattern:

• Eu quero sair.
• Ela precisa estudar.
• Nós costumamos conversar.

The first verb is conjugated; the second one stays in the infinitive.