Остальные уже сидят в зале.

Остальные means the others, the rest, or the remaining ones.

In this sentence, it is being used on its own, without a noun. Russian often does this when the noun is understood from context.

For example:

• остальные люди = the other people / the rest of the people
• остальные = the others / the rest

So Остальные уже сидят в зале means something like The others are already sitting in the hall.

It is plural because it refers to more than one person.

The verb also shows this:

• сидят = they are sitting

So the sentence structure is:

• Остальные = plural subject
• сидят = plural verb form

If it were singular, you would expect something like:

• остальной сидит — but this is much less natural by itself when talking about people
• more commonly: остальной человек or a different phrasing would be used

Here остальные is in the nominative plural because it is the subject of the sentence.

You can tell because it is the thing doing the action:

• Остальные already сидят

So:

• nominative singular masculine: остальной
• nominative plural: остальные

In this sentence, остальные acts like a noun even though it originally comes from an adjective.

This is a very common question because Russian distinguishes between being in a seated position and sitting down.

• сидеть = to be sitting
• сесть = to sit down
• садиться = to sit down / be in the process of sitting down

So:

• Остальные уже сидят в зале = The others are already sitting / are already seated in the hall
• Остальные уже сели в зале = The others have already sat down in the hall
• Остальные садятся в зале = The others are sitting down in the hall

The original sentence focuses on their current state, not the action of taking a seat.

Сидят is the 3rd person plural form of сидеть.

Conjugation of сидеть in the present tense:

• я сижу = I am sitting
• ты сидишь = you are sitting
• он / она сидит = he / she is sitting
• мы сидим = we are sitting
• вы сидите = you are sitting
• они сидят = they are sitting

Since остальные means the others / they, the sentence uses сидят.

After в when it means in and shows location, Russian uses the prepositional case.

• зал = hall / auditorium
• prepositional: в зале = in the hall

So:

• в зале = in the hall
• в комнате = in the room
• в школе = in the school

This sentence is about where they are sitting, so it uses the location meaning of в.

Yes. В зал usually means into the hall, showing motion toward the hall, not location inside it.

Compare:

• Остальные уже сидят в зале = The others are already sitting in the hall
• Остальные идут в зал = The others are going into the hall / to the hall

So:

• в зале = location, prepositional case
• в зал = direction, accusative case

Уже means already.

It tells us that the action or state has happened earlier than expected or before some reference point.

So:

• Остальные сидят в зале = The others are sitting in the hall
• Остальные уже сидят в зале = The others are already sitting in the hall

It often adds a sense like by now or at this point.

Yes. Russian word order is more flexible than English word order, although the most neutral version here is:

• Остальные уже сидят в зале.

Other possible orders include:

• Уже остальные сидят в зале.
• В зале уже сидят остальные.
• Остальные сидят уже в зале.

These alternatives may sound less neutral or may shift the emphasis. For example:

• В зале уже сидят остальные emphasizes where
• Остальные уже сидят в зале is the most straightforward, neutral statement

So the original sentence is probably the best default version for a learner.

No. It can refer to people or things, depending on context.

For example:

• Остальные уже пришли. = The others have already arrived. → probably people
• Остальные книги на столе. = The other books are on the table. → things

In your sentence, because of сидят and в зале, it clearly refers to people.

Yes, in natural English that can work, depending on context.

A more literal translation is:

• The others are already sitting in the hall
• The rest are already sitting in the hall

But in smooth English, people may also say:

• The others are already in the hall
• The rest are already seated in the hall

The Russian sentence specifically includes сидят, so the idea of being seated / sitting is there, even if English sometimes leaves it implicit.

The stress is:

• остАльные
• ужЕ
• сидЯт
• в зАле

A rough pronunciation guide:

• остАльные ≈ ah-STAL-ny-ye
• ужЕ ≈ oo-ZHE
• сидЯт ≈ see-DYAT
• в зАле ≈ v ZA-leh

So the full sentence sounds roughly like:

• ah-STAL-ny-ye oo-ZHE see-DYAT v ZA-leh

This is only approximate, but it can help with reading aloud.