Eu não vou sair de casa hoje porque estou cansado.

Yes. In Brazilian Portuguese, Eu is often optional because the verb already shows who the subject is.

• Eu não vou sair de casa hoje...
• Não vou sair de casa hoje...

Both mean the same thing: I’m not going to leave the house today...

Including Eu can add emphasis, clarity, or contrast, especially if you want to stress I.

Não vou sair uses the very common ir + infinitive structure, which works like going to + verb in English.

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

So:

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

This is one of the most natural ways to talk about the near future in Brazilian Portuguese.

In Portuguese, não usually goes directly before the verb it negates.

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

You do not say something like vou não sair in standard Portuguese for this meaning.

A useful basic pattern is:

• subject + não + verb

For example:

• Eu não sei = I don’t know
• Ela não quer = She doesn’t want
• Nós não vamos = We’re not going

They are different verbs.

• ir = to go
• sair = to leave / to go out

In vou sair, the first verb vou comes from ir and helps form the future expression going to. The main action is sair.

So:

• vou sair literally looks like I go to leave, but naturally it means I’m going to leave / go out

This is similar to English using going to for the future.

De casa means from home or out of the house/home.

In this sentence, sair de casa is a very common expression meaning:

• to leave home
• to go out
• to go out of the house

Why not da casa?

• de + a = da
• So da casa would literally mean from the house

But Portuguese often uses casa without an article when it means home in a general sense.

Compare:

• Estou em casa = I’m at home
• Saí de casa cedo = I left home early

If you say da casa, it sounds more like you are talking about a specific house as an object, not home in the usual personal sense.

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

Common examples:

• em casa = at home
• para casa = home
• de casa = from home

But when casa means the house as a physical building, an article is more likely:

• a casa é grande = the house is big
• saí da casa do meu amigo = I left my friend’s house

So in your sentence, de casa sounds natural because the meaning is from home.

Hoje means today.

In this sentence:

• Eu não vou sair de casa hoje... = I’m not going to leave home today...

Yes, hoje can sometimes move around:

• Hoje eu não vou sair de casa...
• Eu hoje não vou sair de casa...

All are possible, but the most neutral version here is:

• Eu não vou sair de casa hoje...

Changing the position can slightly shift emphasis.

Because porque here means because and introduces the reason.

• ...porque estou cansado. = ...because I’m tired.

This is the most common use of porque.

Learners often confuse these forms:

• porque = because
• por que = why / for what reason
• porquê = the reason (a noun)
• por quê = usually why at the end of a question

In your sentence, the correct form is porque because it gives the reason.

Because estar is used for a temporary state or condition, and being tired is usually temporary.

• estou cansado = I’m tired

Using ser here would usually sound unnatural for normal everyday tiredness.

A helpful rule:

• ser = more permanent characteristics, identity, classification
• estar = temporary states, conditions, location

Examples:

• sou brasileiro = I am Brazilian
• estou cansado = I am tired
• estou em casa = I am at home

Cansado changes according to the gender of the person speaking.

• A man usually says estou cansado
• A woman usually says estou cansada

So the sentence would become:

• Eu não vou sair de casa hoje porque estou cansada.

This is a very common kind of adjective agreement in Portuguese.

Yes. You can stop at:

• Eu não vou sair de casa hoje.

That simply means I’m not going to leave home today.

Adding porque estou cansado gives the reason:

• ...because I’m tired

Portuguese, like English, often allows you to leave out the reason if it is already understood.

Yes, depending on context.

• sair de casa can mean leave home
• It can also feel like go out in everyday speech

For example:

• Hoje não vou sair de casa can sound like I’m not going out today
• But more literally it is I’m not leaving home today

Both are reasonable depending on the context and the translation style.

Yes, very natural.

A Brazilian speaker would easily say:

• Eu não vou sair de casa hoje porque estou cansado.

Even more naturally in casual speech, the pronoun might be dropped:

• Não vou sair de casa hoje porque estou cansado.

Both are completely normal. The second one is often more conversational.

Yes, but it changes the tone a little.

• ...porque estou cansado is the most neutral and common everyday choice.
• ...pois estou cansado is correct, but can sound a bit more formal or literary depending on context.

In normal spoken Brazilian Portuguese, porque is usually the best option here.

Yes, a few useful points:

1. não
   The ão sound is nasal, which may be difficult for English speakers.

2. vou sair
   In fast speech, it may sound very connected, almost like one unit.

3. de casa
   The de is often pronounced more lightly in casual Brazilian speech.

4. porque estou
   In natural speech, these words flow together smoothly.

So even though the sentence is written clearly word by word, spoken Brazilian Portuguese often sounds more connected than English learners expect.

Yes. That is also a very good translation.

Depending on context, não vou sair de casa hoje could be translated as:

• I’m not going to leave the house today
• I’m not going to leave home today
• I’m not going out today

All of these can work. The best choice depends on how literal or natural you want the English translation to sound.