Đáp án:
1. Ba used to type faster than he do now.
2. This is the first time we have visited the park.
3. We have lived here for 15 years.
4. It was such small room that we couldn't live in it together.
5. I wish he spoke English well.
6. $\to$ It is said that he is an excellent student.
$\to$ He is said to be an excellent student.
7. Unless he work hard, he won't fail the exam.
8. If she had enough money, she would buy a new computer.