1)

1. You don't have do It today.
2. What time do we have to be at the airport?
3. I think we should call a taxi now.
4. Jane has to work on Saturdays.
5. She should get a new job.
6. Luke doesn't has wear a school uniform.
7. All his brothers and sisters have to.
8. Does he has to go on a diet?
9. No, he doesn't (has to), but I think he should.

2)

1. I've got bad marks.
2. I've bought  defective headphones.
3. I've lost my keys.
4. I've lost my money.

3)

1. - +
2. + -
3. - +
4. - +
5. - +