Ответ:
2. I wouldn't say that to her, if I weren't sure she would understand me properly.
3. If you don't wake up on time, you will be late for school.
4. We'll stay at home unless it stops raining.
5. If you didn't go to the gym so often, you wouldn't be strong and healthy.
6. Unless you invite her to the party, she won't come to your place.
7. She wouldn't have forgotten the appointment, if she had put it down in her notebook.
8. We would have reached the airport on time, if we hadn't got stuck in a traffic jam.
9. If you drive so carelessly, you will get into trouble.
10. If I had got to the station earlier, I would have caught the train.