1.
2) can't
3) can
4) Can
5) can't
6) can, can't
2.
2) My dad has to get up early.
3) I don't have to tidy my room.
4) Does your mum have to cook every day?
5) My dog doesn't have to sleep outside.
6) Do you have to help with the housework?
3.
2) We don't have to do Exercise 4 for homework.
3) The techer has to arrive at school before 8.00.
4) Peter doesn't have to take the rubbish out at weekends.
5) Does your dad have to take the train to work?
6) At university my sister doesn't have to get up early every day.
4.
1) b
2) a
3) c
4) c
5) b
6) a
5.
2) don't
3) can
4) should
5) can't
6) has
7) does
8) have
9) should