.4. Unless your sister studies harder, she won't fail the exam
5.5. If they had enough time. they could do me a favor.
6.6. If we don’t hurry up, we will be late for the exam.
7.7. If Peter prepared his lesson well, he wouldn’t get bad marks.
8.8. If he had enough qualifications, he would apply for the job.
9.9. If this car weren’t expensive, we could buy it.
10.10. If he doesn’t phone her immediately, he won’t get any information.
11.11. Unless you aren't careful, you will have any accidents.
13.13. If I don't smoke, this room had better
