Bạn còn ở trong văn phòng à?

you

Breakdown of Bạn còn ở trong văn phòng à?

• ở: at
• à: (question marker)
• trong: in (enclosed by something)

Questions & Answers about Bạn còn ở trong văn phòng à?

What does còn mean here?

In this sentence, còn means still.

So Bạn còn ở trong văn phòng à? means something like:

• Are you still in the office?
• You’re still in the office?

It suggests that the speaker expected the person might have left already.

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Why are both ở and trong used?

They do different jobs:

• ở = to be/stay at, in
• trong = inside/in

So ở trong văn phòng literally means be inside the office.

A very natural shorter version is:

• Bạn còn ở văn phòng à?

Adding trong puts a bit more focus on being physically inside the office.

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What does the final à mean?

À is a sentence-final particle used to make the sentence sound like a question, often with a tone of:

• surprise
• checking
• realization
• mild curiosity

So this sentence can feel like:

• Oh, you’re still in the office?
• Are you still in the office?

It is not exactly the same as plain English are; it adds attitude or feeling.