Ele vai partir amanhã.

Because Portuguese often uses ir + infinitive to talk about the future.

• vai = goes / is going
• partir = to leave / depart

So vai partir means is going to leave or simply will leave.

This is very common in Brazilian Portuguese, especially in everyday speech.

In this sentence, vai is acting like a helper verb, not showing literal movement.

So:

• Ele vai partir amanhã = He is going to leave tomorrow
• not He goes leave tomorrow

English does something similar with going to:

• He is going to leave

Portuguese uses ir in much the same way.

Yes. Ele partirá amanhã is also correct and means the same thing: He will leave tomorrow.

The difference is mainly style:

• Ele vai partir amanhã = more common in everyday Brazilian Portuguese
• Ele partirá amanhã = more formal, more written, or more literary

In conversation, Brazilians are much more likely to say vai partir.

Here, partir means to leave, to depart, or to set off.

It is often used for departures, trips, or somewhat more formal situations.

Examples:

• O avião vai partir às oito. = The plane will leave at eight.
• Eles partiram cedo. = They left early.

However, partir can also mean to split, to break, or to divide, depending on context. In Ele vai partir amanhã, the context makes leave/depart the natural meaning.

Not usually in casual everyday speech.

A more common verb is sair.

Compare:

• Ele vai sair amanhã. = He is going to leave tomorrow / go out tomorrow
• Ele vai partir amanhã. = He is going to depart tomorrow

Partir can sound a bit more formal, literary, or travel-related than sair. It is correct, but not always the most colloquial choice.

Yes, Portuguese can drop subject pronouns, and you could say:

• Vai partir amanhã.

However, Brazilian Portuguese often keeps subject pronouns more than European Portuguese does.

So ele may be included:

• for clarity
• for emphasis
• because that sounds natural in Brazilian Portuguese

Both are possible, depending on context.

No, it does not have to be at the end.

All of these are possible:

• Ele vai partir amanhã.
• Amanhã ele vai partir.
• Ele amanhã vai partir. (possible, but less natural in many contexts)

The most neutral and natural version here is Ele vai partir amanhã.

Putting amanhã first can give it more emphasis:

• Amanhã ele vai partir. = Tomorrow, he’s leaving.

Because amanhã works as a time adverb meaning tomorrow.

Portuguese, like English, often uses time words directly:

• hoje = today
• amanhã = tomorrow
• ontem = yesterday

So you say:

• Ele vai partir amanhã.

Not:

• Ele vai partir em amanhã.

In Brazilian Portuguese, amanhã is pronounced roughly like ah-mah-NYÃ.

A few important points:

• The stress is on the last syllable: -nhã
• nh sounds like ny in canyon
• ã is nasal, so the sound comes partly through the nose

So it is not pronounced like a plain a at the end. The nasal sound is very important.

A simple approximate guide:

• vai ≈ vie
• partir ≈ par-CHEER in many Brazilian accents, or more carefully par-TEER

A few notes:

• vai is one syllable
• partir is stressed on the last syllable: par-TIR
• In many Brazilian pronunciations, ti before a vowel can sound like chi, but in partir, the final tir is often closer to teer or cheer, depending on accent

An approximate full pronunciation:

• EH-lee vai par-TEER ah-mah-NYÃ

Yes, in natural English translation it can often be rendered in several ways:

• He is going to leave tomorrow.
• He will leave tomorrow.
• He is leaving tomorrow.

The Portuguese form vai partir clearly points to the future. English has several natural ways to express that same future idea.

Usually it suggests a future event that is expected, planned, or seen as likely.

The construction ir + infinitive often gives the sense of:

• an intended future action
• a scheduled event
• something about to happen
• a prediction based on current expectation

So without more context, it most naturally sounds like a real upcoming departure.

In theory, partir can mean break or split, but this sentence would normally be understood as leave/depart.

Why?

Because:

• the subject is ele (he)
• amanhã gives a time for an event
• partir with a person as subject commonly means depart

If you wanted break in a clear way, the sentence would usually need a different object or context, such as:

• Ele vai partir o galho amanhã. = He is going to break the branch tomorrow.

So in this sentence, learners should understand partir as leave/depart.