A gerente vai revisar a planilha amanhã.

Because the sentence is talking about a female manager.

In Brazilian Portuguese, gerente often has the same form for both masculine and feminine. The gender is usually shown by the article:

• o gerente = the male manager
• a gerente = the female manager

So a gerente tells you the manager is a woman.

Portuguese often leaves out the subject pronoun when it is clear from context or from the verb.

So instead of saying:

• Ela vai revisar a planilha amanhã

it is very natural to say:

• A gerente vai revisar a planilha amanhã

Since a gerente is already the subject, adding ela would usually be unnecessary.

Vai revisar is the very common spoken way to express the future in Brazilian Portuguese.

It uses:

• ir in the present tense + infinitive

So:

• vai revisar = is going to review / will review

The simple future revisará is correct too, but it often sounds more formal or written. In everyday Brazilian Portuguese, vai revisar is usually the more natural choice.

Because the subject is singular: a gerente.

Portuguese verbs must agree with the subject:

• a gerente vai = the manager goes / is going to
• as gerentes vão = the managers go / are going to

Since there is only one manager here, vai is the correct form.

Here a means the.

• a planilha = the spreadsheet

Portuguese uses definite articles very often, just like English in many cases. In this sentence, it refers to a specific spreadsheet that is known in the context.

Compare:

• revisar a planilha = review the spreadsheet
• revisar uma planilha = review a spreadsheet

Planilha usually means spreadsheet.

In business, office, or school contexts, it often refers to something like an Excel spreadsheet or a table used for organizing data.

So revisar a planilha means checking or reviewing that spreadsheet.

Yes. Amanhã is flexible in Portuguese.

All of these are natural:

• A gerente vai revisar a planilha amanhã.
• Amanhã, a gerente vai revisar a planilha.
• A gerente amanhã vai revisar a planilha.

The most neutral version is the original one, with amanhã at the end. Putting amanhã first can give it a little more emphasis.

Usually, yes.

Revisar can mean:

• to review
• to check
• to revise

In this sentence, revisar a planilha most naturally means something like:

• review the spreadsheet
• check the spreadsheet

The exact English word depends on context, but revisar is a very common verb for checking something carefully.

The lh sound in Brazilian Portuguese is similar to the lli sound in million for many English speakers.

So planilha sounds roughly like:

• pla-NEEL-ya

Not an exact English match, but close enough for learning.

Also:

• ni here sounds like nee
• the stress is on ni: pla-NI-lha

Yes, absolutely.

That sentence is grammatically correct and means the same thing.

The difference is mainly style:

• vai revisar = very common, conversational, natural in speech
• revisará = more formal, more typical of writing, announcements, or formal statements

In everyday Brazilian Portuguese, learners will hear vai revisar much more often.

Because Portuguese builds this structure differently.

After the verb ir used for the future, Portuguese normally uses the infinitive directly:

• vai revisar
• vou estudar
• vamos sair

There is no extra word like English to in this structure.

So:

• is going to review → vai revisar
• not vai a revisar in normal Brazilian Portuguese usage

It is neutral and very natural.

Nothing in the sentence is especially slangy or especially formal. It would work well in:

• workplace conversation
• everyday speech
• emails
• simple written communication

So it is a very useful real-life model sentence.