1)
1. should
2. do you have to
3. wouldn't
4. mustn't
5. shouldn't
2)
1. mustn't -> must
2. have to -> do you have to
3. should to see -> should see
4. don't have to -> mustn't
5. don't should -> should
3)
1. would
2. most
3. don't have to
4. if
5. should