are you live in a dorm,aren’t you?
あなたって寮で暮らしてるんじゃなかった？

はこれでいいでしょうか？教えて下さい＾＠＾

Do you live in domitory ?
寮生活ですか？

相手にとっては暮らしてますかと聞かれればある一定期間のことだと考えますよね。
付加疑問分の必要はないです。

　

in the domitory
冠詞忘れてた 　

付加疑問文でいいたいのなら
You are living in a dorm, aren’t you?
だと思いますが。。でもまちがってたらきっとＤａｎａさんが指摘してくれるわね。。（＾＾） 　

There are many ways to ask this question - they are quite similar in meaning but have a different feeling to them.

1) You live in a dorm, don’t you? -

This is a negative tag question a positive statement with a negative question at the end. The feeling is that you are quite sure that the statement of the question is correct.90%sure.

2) Do you live in a dorm?
This is a direct question and means that you really don’t know the answer.50% sure (maybe yes, maybe no).

3) Don’t you live in a dorm?
This is a question that is confirming that you think that the person does live in a dorm. 75% sure.

In this case I think that the correct question for this is 3. 　

Oops, Res.3さん is correct.
#You are living in a dorm, aren’t you?

#(1)You live in a dorm, don’t you?

　

Thank you, Dana.
from Res.3 　

Res.3さん;

No worries!!