Do you study English at school?
Yes, I do. / Yes, we do.
Does she work in a TV studio?
No, she doesn't.
Am I reading a book?
Yes, you are.
Did they enjoy the film on TV last night?
No, they didn't.
Are you playing a game?
Yes, I am.
Is he going to have dinner alone tonight?
No, he isn't.
Does Tom go to school by bus?
No, he doesn't.
Did the dog bark when you arrived late last night?
No, it didn't.