"You are Turkish aren't you?" would be "Türksün değil misin?"? Or does Turkish have a different way to ask this kind of question? (it is, isn't it? / it isn't, is it?)
Türk'sün, değil mi?
The "isn't it/aren't they/aren't you?/don't you/doesn't she?" part is always "değil mi?"
P.S.: "Değil mi" is pronounced "Dimi".
Are you turk or not?
Although turk and turkish are same