1) He is a good boy, isn't he? She is a beautiful girl, isn't she?
2) You wrote him a letter, didn't you? He opened the door, didn't he?
3) They won't be here tomorrow, will they? She will go to Moscow, won't she?
4) She hasn't told everyone, has she? You have never been abroad, haven't you?
5) She has been reading since 3 p.m., hasn't she? You haven't been doing it for a long time, have you?