O profissional responsável vai revisar o relatório antes da reunião.

O is the masculine singular definite article, meaning the.

In O profissional responsável..., it matches profissional, which here is treated as a masculine singular noun: the professional.

Portuguese uses definite articles more often than English, so the professional responsible is naturally expressed as o profissional responsável.

Profissional means professional or staff member / qualified worker, depending on context.

In this sentence, it refers to the person in charge or the responsible professional/person. It is a noun here, not just an adjective.

Also, profissional has the same form for masculine and feminine:

• o profissional = the male professional
• a profissional = the female professional

In Portuguese, adjectives often come after the noun.

So:

• o profissional responsável = the responsible professional / the professional in charge

This word order is very normal in Portuguese. Putting responsável after the noun sounds natural and standard.

Also, in this sentence, responsável can mean not just responsible in a general personality sense, but more specifically the one responsible / the one in charge.

No. Responsável is an adjective with the same form for both masculine and feminine singular.

Examples:

• o profissional responsável
• a profissional responsável

The plural changes:

• os profissionais responsáveis
• as profissionais responsáveis

So only the article and noun clearly show gender; responsável itself stays the same in the singular.

Vai revisar is the very common ir + infinitive structure, which expresses the future:

• vai = goes / is going
• revisar = to review

Together:

• vai revisar = is going to review / will review

In everyday Brazilian Portuguese, this structure is extremely common and often sounds more natural than the simple future.

This sentence could also be written as:

• O profissional responsável revisará o relatório antes da reunião.

That also means will review, but it sounds more formal or written.

Because the subject is singular: O profissional responsável.

The verb ir must agree with the subject:

• eu vou
• você/ele/ela vai
• nós vamos
• eles/elas vão

Since the professional responsible is a singular third-person subject, vai is the correct form.

In this sentence, revisar means to review, to check, or to go over a document.

For example:

• revisar o relatório = review the report

This can be a little tricky for English speakers because English revise often means edit or study again, especially in British English. Portuguese revisar often means carefully checking something for errors, quality, or completeness.

Depending on context, revisar can also mean:

• inspect
• proofread
• check over

Relatório is a masculine singular noun, so it takes o:

• o relatório = the report

The ending -ório is a clue here, but you should still learn nouns with their articles when possible.

So:

• o relatório
• um relatório

Because antes de is the correct structure in Portuguese.

You say:

• antes de + noun
• antes de + infinitive

So:

• antes de sair = before leaving
• antes da reunião = before the meeting

Here, de + a reunião contracts into da reunião:

• de + a = da

That is why you get antes da reunião.

Da is a contraction of de + a.

So:

• antes da reunião literally breaks down as:
• antes de a reunião

But Portuguese normally contracts these:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

So da reunião means of the meeting in literal structure, but in this sentence the full phrase means before the meeting.

Because reunião is a feminine noun in Portuguese:

• a reunião = the meeting

Its gender is grammatical and must simply be learned with the noun. That feminine gender is why the sentence uses da:

• de + a reunião = da reunião

In Brazilian Portuguese, reunião is pronounced approximately like:

heh-oo-nee-OWN

A few things to notice:

• the initial r in Brazilian Portuguese is often pronounced like an English h sound
• nião ends with a nasal sound
• the ão ending is very common in Portuguese and is nasal, not a plain ow

The stress is on the last syllable:

• re-u-ni-ÃO

The accent mark in reunião shows the stressed syllable and helps indicate pronunciation.

The stress falls on the last syllable:

• re-u-ni-ão

In Portuguese, accent marks are important because they often tell you where the stress goes and sometimes distinguish words that would otherwise be read differently.

Yes, depending on context.

Literally, it is the responsible professional or the professional in charge, but in natural English it may be translated more flexibly as:

• the person responsible
• the staff member in charge
• the responsible professional

If the context is a workplace, medical setting, technical team, or office, profissional may be broader than the English word professional sometimes sounds.

Not naturally in this sentence.

Portuguese usually includes the article when referring to a specific known thing:

• o relatório = the report
• a reunião = the meeting

So revisar relatório antes de reunião would sound incomplete or unnatural in standard Portuguese.

The sentence sounds natural because it refers to a specific report and a specific meeting already understood in context.

Yes, mainly in style.

• vai revisar = very common, natural, everyday Brazilian Portuguese
• irá revisar = more formal, more written, less conversational

Both are correct and both mean will review.

So:

• O profissional responsável vai revisar o relatório... sounds normal and natural in speech.
• O profissional responsável irá revisar o relatório... sounds more formal or official.

Some changes are possible, but the original order is the most neutral and natural:

• O profissional responsável vai revisar o relatório antes da reunião.

You could move the time phrase for emphasis:

• Antes da reunião, o profissional responsável vai revisar o relatório.

That still means the same thing, but it emphasizes before the meeting.

However, changing the order too much can sound unnatural for learners, so the original is a very good standard pattern to remember: subject + vai + infinitive + object + time expression.