1/ Were you sleeping at six o'clock this morning?
2/ Did your mum work yesterday?
3/ Were you watching TV at nine o'clock last night?
4/ Was your teacher talking 5 minutes ago?
5/ Were you studying English at three o'clock yesterday afternoon?
1/ Yes, I was
2/ Yes, she did
3/ No, I wasn't
4/ Yes, he was
5/ No, I wasn't