Does he understand?
Doesn’t he understand?
Will you come in?
Won’t you come in?
Are you a vegetarian?
Aren't you a vegetarian?
Would you like something to drink?
Wouldn’t you like something to drink?
Can you do that tomorrow?
Can’t you do that tomorrow?
Is she sick today?
Isn't she sick today?
Did you quit your job last week?
Didn't you quit your job last week?
Are you tired?
Aren't you tired?
Do you live with five friends?
Don’t you live with five friends?
Has she been to Europe?
Hasn't she been to Europe?