Đáp án:
I - 1. had seen
2. was
3. have been
4. am enjoying
5. have worked
6. arrived
7. is
8. would come
9. haven't changed
10. know
II - 1. If I didn't have enough money, I wouldn't buy that laptop.
2. She said that she had to study hard for her next examination.
3. You won't be allowed to go in the house.
4. The man who is standing over there is my uncle.
5. Their exercises weren't finished on time.
6. The explorer who discovered America was Christopher Columbus.
7. Although he has a good learning condition, he doesn't study well.
8. How about going swimming tomorrow afternoon?
9. Jane speks English better than Jane.
10. He wasn't tall enough to reach the switch.