II-

3.If Peter didn't eat much, he wouldn't be overweight

4.If Sarah studied hard, she wouldn't hate school

5.If people didn't leave door open, the office wouldn't be cold

6.If I spoke Japanese, I could translate it.

7.If he wasn't very lazy, he wouldn't fail the final exam

8.If the weather was fine, the children would play outside

9.If it snowed, we would go skiing

10.If the students didn't miss the school bus, they wouldn't be late for school.

III-

1.do you

2.doesn't he

3.doesn't he

4.isn't it

5.does he

6.shall we

7.won't you

8.won't they

9.am not I

IV-

1.is being built

2.arrived/slept

3.climbing

4.is reparing

5.have tried/haven't succeeded

6.had/was repairing

7.wears/is wearing

8.going

Chúc bạn học tốt! (Cần thì mk bổ sung thêm nha)