Ex.1
0. have to see
1. don't have to work
2. has to practise
3. doesn't have to stay
4. have to help
5. don't have to go
Ex.2
0. Does Dad have to
1. do we have to
2. Does Jack have to
3. does she have to
4. Do they have to
Ex.3
0. shouldn't
1. should
2. should I do
3. should
4. Should I wait
5. shouldn't
