Vão rebocar o carro amanhã.

This is the very common ir + infinitive future in Brazilian Portuguese:

• vão = they go / are going
• rebocar = to tow

So vão rebocar means are going to tow.

Portuguese also has a simple future form, rebocarão, but in everyday Brazilian Portuguese, vão rebocar is much more natural and common in speech.

Because after the verb ir when it is used to form the near future, the next verb stays in the infinitive:

• vou sair = I’m going to leave
• vamos comer = we’re going to eat
• vão rebocar = they’re going to tow

So vão is the conjugated verb, and rebocar does not change.

Vão is the 3rd person plural form of ir, so it can mean:

• they are going to
• sometimes you all are going to in European Portuguese, but in Brazil that is much less likely here

In Brazilian Portuguese, with no subject stated, the most natural reading is they or some unspecified people / authorities.

In context, this could mean something like:

• the tow truck company
• parking enforcement
• building staff
• the police

Portuguese often leaves the subject unstated when it is understood from the verb form.

Yes, absolutely.

That would be correct and natural. But Portuguese often drops subject pronouns when the verb already makes the subject clear.

So both are fine:

• Vão rebocar o carro amanhã.
• Eles vão rebocar o carro amanhã.

The version without eles is very common.

Because Portuguese usually uses the definite article more often than English does.

• o carro = the car

In Portuguese, talking about a specific car often naturally includes the article. English sometimes omits articles in places where Portuguese does not.

So rebocar carro would sound incomplete here; rebocar o carro is the normal structure.

Yes. Amanhã is flexible.

All of these are possible:

• Vão rebocar o carro amanhã.
• Amanhã vão rebocar o carro.
• Vão amanhã rebocar o carro. (possible, but less common/stiffer in everyday speech)

The most natural options are usually:

• Vão rebocar o carro amanhã.
• Amanhã vão rebocar o carro.

Putting amanhã at the end is very normal and neutral.

It refers to the future.

Vão rebocar means are going to tow / will tow.

It does not mean the action is happening right now.

If the car were being towed at this moment, you might say something like:

• Estão rebocando o carro. = They are towing the car.

So vão rebocar points to a later action.

Yes, grammatically that is correct.

• Rebocarão o carro amanhã.

But in Brazilian Portuguese, that sounds more formal, written, or less conversational. In everyday speech, people usually prefer:

• Vão rebocar o carro amanhã.

So the sentence you were given is the most natural everyday phrasing.

Vão has a nasal sound.

A rough guide for English speakers:

• v as in van
• ão is a nasal diphthong, somewhat like ow/ng blended together, but not exactly

It is approximately like vaung, but with the vowel nasalized and without a strong final g sound.

Important points:

• the tilde (ã) marks nasalization
• the o is part of the nasal ending ão
• the stress is on vão

So it is not pronounced like vao with a normal English vowel.

No. Rebocar can mean to tow in general, especially with vehicles:

• rebocar um carro = tow a car
• rebocar um barco = tow a boat

Depending on context, the verb can have other meanings in Portuguese, but in this sentence, with o carro, it clearly means to tow.

Because o carro is the thing receiving the action, not doing it.

In:

• Vão rebocar o carro amanhã.

the hidden subject is they, because vão is plural.
The object is o carro.

A useful breakdown:

• Vão = they are going to
• rebocar = tow
• o carro = the car
• amanhã = tomorrow

So the structure is:

[They] + are going to tow + the car + tomorrow

Yes. A passive version would focus more on the car:

• O carro vai ser rebocado amanhã. = The car is going to be towed tomorrow.

This is also very natural.

Difference in focus:

• Vão rebocar o carro amanhã. → focuses on the people doing the towing, even if they are not named
• O carro vai ser rebocado amanhã. → focuses on the car

Both are common, but the original sentence is very natural in everyday speech.

It can be either, depending on context.

Vão rebocar o carro amanhã could mean:

• a definite scheduled action
• a prediction
• a warning
• a plan or intention by someone

For example:

• If a parking officer says it, it may sound like a real scheduled action.
• If a friend says it, it may sound like a warning: They’re going to tow the car tomorrow.

So the grammar gives a future meaning, but the exact force depends on the situation.