一般的
Are you from Xian?---->Do you come from Xian?
Is he from Xian?---->Does he come from Xian?
Are they from Xian?---->Do they come from Xian?
Is she from Xian?---->Does she come from Xian?
特殊的
Where are you from?---->Where do you come from?
Where are they from?---->Where do they come from?
Where is he from?---->Where does he come from?
Where is she from?---->Where does she come from?