Se você recusar esse assento, talvez o próximo fique longe da janela.

After se when Portuguese talks about a real possibility in the future, it commonly uses the future subjunctive:

• Se você recusar... = If you refuse / if you do refuse...

So this is the normal pattern:

• Se você aceitar... = If you accept...
• Se ele vier... = If he comes...
• Se nós tivermos tempo... = If we have time...

With many regular verbs, the future subjunctive looks the same as the infinitive, so recusar here is not just a plain infinitive in meaning; it is functioning as the future subjunctive.

Using recusará would mean you will refuse, and that does not fit naturally after se in this kind of sentence.

In Brazilian Portuguese, você takes third-person singular verb forms.

So:

• você recusar
• você fica
• você fique

This is completely normal. Even though você means you, grammatically it behaves like ele/ela for verb conjugation.

Examples:

• Você é = You are
• Você foi = You went
• Se você quiser = If you want

Because talvez often triggers the subjunctive when it expresses uncertainty or possibility.

Here, the speaker is not stating a fact; they are saying something may happen:

• talvez o próximo fique longe da janela = maybe the next one will be far from the window

That uncertainty is why Portuguese uses fique (present subjunctive), not fica (present indicative).

Compare:

• Ele fica longe da janela. = It is far from the window.
  
  • factual / neutral statement
• Talvez ele fique longe da janela. = Maybe it will be far from the window.
  
  • uncertain / possible

O próximo means the next one.

The noun assento is omitted because it is already understood from the previous part of the sentence:

• esse assento = this seat
• o próximo = the next one / the next seat

This is very common in Portuguese, just like in English.

In everyday Brazilian Portuguese, esse is very commonly used for this/that in situations where spoken English would often just say this.

Traditional grammar often makes a distinction like this:

• este = this, near the speaker
• esse = that, near the listener or already mentioned
• aquele = that over there

But in real Brazilian usage, esse frequently replaces este in normal conversation. So esse assento sounds very natural.

Because de + a contracts into da in Portuguese.

So:

• de + a janela → da janela

This kind of contraction is very common:

• de + o = do
• em + a = na
• em + o = no
• por + a = pela
• a + a = à

So longe da janela literally comes from far from the window.

More or less, yes. The adjective/adverb longe normally goes with de:

• longe de casa = far from home
• longe do centro = far from downtown
• longe da janela = far from the window

So when you learn longe, it is useful to remember it together with de.

Yes. Longe da janela means far from the window, and perto da janela means near the window.

So you could contrast:

• Talvez o próximo fique longe da janela. = Maybe the next one will be far from the window.
• Talvez o próximo fique perto da janela. = Maybe the next one will be near the window.

Notice that perto also commonly uses de:

• perto da escola
• perto do carro

Here ficar means something like to end up being / to be located / to be situated.

So:

• o próximo fique longe da janela = the next one may be far from the window

Portuguese uses ficar in several ways, including:

• ficar em casa = to stay at home
• ficar pronto = to become ready / end up ready
• ficar longe = to be located far away

In this sentence, it is about the seat’s position.

The comma separates the if-clause from the main clause:

• Se você recusar esse assento,
• talvez o próximo fique longe da janela.

This is very common in Portuguese and also natural in English writing:

• If you refuse this seat, maybe the next one will be far from the window.

Yes. Talvez is flexible in Portuguese.

These are all possible, though the tone may shift slightly:

• Talvez o próximo fique longe da janela.
• O próximo talvez fique longe da janela.
• Se você recusar esse assento, talvez o próximo fique longe da janela.

The version in your sentence is very natural because talvez introduces the uncertain result clearly.

Yes. Assento is a standard word for seat, especially in places like:

• airplanes
• buses
• theaters
• waiting areas

Depending on context, Portuguese might also use:

• cadeira = chair
• lugar = spot/place/seat

But in a sentence like this, assento is a very natural choice.

In Brazilian Portuguese, próximo is usually pronounced roughly like PRO-see-mo or PRO-si-mo, depending on accent.

A few helpful notes:

• the stress is on pró
• the x in próximo often sounds like s
• the written accent mark in ó shows the stressed syllable

So in connected speech:

• o próximo fique longe da janela

may sound quite smooth and quick, with o próximo almost flowing together.