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12. Peter could get good marks if he studied hard

13. If my sister weren't have a terrible headache, she wouldn't be absent from her class

14. If windy had come, we wouldn't have cancelled the meeting

15. Unless he hadn't been angry, he would have said anything

16. If you don't help me, i'll fail again

17. If my house hadn't been guarded by 2 big dogs, it wouldn't have been broken into every night

18. If we don't go, we will be late

19. If you don't be impatient, you will make mistakes

20. If i were you, i wouldn't buy it

21. If he polished his shoes, he would look smart

22. If i were tall enough, i would join the basketball team

23. Unless you leave me alone, i'll call the policeI

II.1. If Rita had got any sleep last night, she wouldn't be exhausted today

2. If he saw the signal, he would stop his car

3. If Peter had prepared his lessons well, he wouldn't get bad marks