I. 

1. If Oanh had known how to solve the maths problem, she would have got high marks.

2. If you had said sorry, she wouldn’t have got angry.

3. If they had passed the exam, their family would have been happy.

4. If it hadn’t rained a lot yesterday, we would have gone swimming.

5. If the weather had been fine, I would have gone camping.

6. If the computer hadn’t broken down, she wouldn’t have stopped her work.

7. If Thanh hadn’t been angry, we would have said something to her.

8. If our teacher had come, we wouldn’t have canceled the party.

9. If Quang hadn’t been interested in the film, he would have studied his lesson.

10. If I hadn’t had a bad headache yesterday, I would have gone to school.

II.

1. If he had prepared for the interview, he would have gotten the job.

2. If we hadn’t run out of money, we wouldn’t have come home from our holiday early.

3. If I had enough free time, I could take much exercise.

4. If the fire brigade hadn’t come immediately, the house would have burnt down.

5. If the men hadn’t been all wearing protective clothing, they wouldn’t have been all quite safe.

6. If people realize how important it is to conserve energy, they will do something about it.

7. If I had known how difficult the job was, I wouldn’t have taken it.

8. If my father had earned much money, life would have been easy for us.

9. If Daniel had had enough money, he would have bought the book.

10. If there was truth in her allegations, I would resign.