Eu não vou sair de casa sem que você me avise.

Yes. Vou sair is the very common ir + infinitive future structure in Portuguese.

• vou = I am going / I will
• sair = to leave / to go out

So Eu não vou sair means I’m not going to leave or I won’t leave.

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

Yes, it could be left out.

Portuguese often drops subject pronouns when the meaning is clear, so:

• Eu não vou sair de casa sem que você me avise.
• Não vou sair de casa sem que você me avise.

Both are correct.

Including Eu can add a little emphasis, contrast, or clarity. For example, it can sound like As for me, I’m not leaving...

Because in Portuguese, não normally goes before the conjugated verb.

Here, the conjugated verb is vou, so:

• não vou sair = I’m not going to leave

This is the standard word order.

Because casa often appears without an article when it means home in a general, idiomatic sense.

This is very common after verbs of movement or location:

• ir para casa = to go home
• estar em casa = to be at home
• sair de casa = to leave home

If you mean a specific house, especially with a modifier, the article is more likely:

• sair da casa da minha avó = to leave my grandmother’s house
• sair da casa branca = to leave the white house

So in this sentence, de casa sounds natural because it means from home / out of the house in a general sense.

Sem que means without ... followed by a full clause.

Here:

• sem que você me avise = without you informing me / without you letting me know

It introduces an action that must not be missing before the main action happens.

In natural English, the whole sentence often comes out as:

• I’m not leaving the house unless you let me know first.
• I won’t leave home without you telling me.

So sem que often overlaps in meaning with unless or without ... first, depending on context.

Because sem que normally requires the subjunctive.

So after sem que, Portuguese uses:

• você me avise = present subjunctive

Not:

• você me avisa = indicative

This happens because the action in the subordinate clause is not presented as a simple fact. It is something expected, required, or still not realized.

So:

• sem que você me avise = without you letting me know

That is very normal in Portuguese.

The present subjunctive is often used for actions that are:

• not yet completed
• uncertain
• dependent on a condition
• located in the present or future

So even though the meaning is future, Portuguese still uses the present subjunctive after expressions like sem que:

• sem que você me avise

This is one of those cases where English and Portuguese organize time differently.

Because você takes third-person singular verb forms in Portuguese.

So although você means you, it grammatically behaves like he/she for verb agreement.

That is why you get:

• você avisa in the indicative
• você avise in the subjunctive

Not:

• você avisas

This is standard Brazilian Portuguese.

Me is the object pronoun me, and in Brazilian Portuguese it commonly goes before the verb:

• você me avise = you let me know

This is the most natural placement in everyday Brazilian Portuguese.

You may also see forms like avise-me, especially in more formal writing, but in Brazil me avise is much more common in normal speech.

Yes, absolutely. That is also very natural.

• sem que você me avise
• sem você me avisar

Both can mean without you letting me know.

The difference is mainly structural:

• sem que + subjunctive
• sem + infinitive (here, with você expressed)

In everyday Brazilian Portuguese, sem você me avisar may even sound a bit more conversational.

It can be both.

Literally, sair de casa means to leave the house / leave home.

Depending on context, it can also sound like go out in the general sense of not staying home.

So the sentence could suggest:

• I’m not leaving home
• I’m not going out
• I’m not stepping out of the house

The exact shade depends on the situation.

Yes, slightly.

• Eu não vou sair de casa sem que você me avise points to a specific future action or decision: I’m not going to leave...
• Eu não saio de casa sem você me avisar sounds more like a general rule, habit, or firm principle: I don’t leave home without you letting me know

Both are correct, but they are not identical in nuance.

Yes. The sentence expresses a condition or requirement.

The speaker is saying that leaving the house will only happen if the other person gives notice first.

A natural way to feel the sentence is:

• I won’t leave the house unless you let me know.
• I’m not leaving home without you warning me first.

So the idea is not just future action, but also dependence on the other person’s action.