1. By the time you arrive, I (write) the essay. 2. By this time tomorrow they (visit) Paris. 3. By the time he intends to get to the airport, the plane (take) off. 4. By the year 2012 many people (lose) their jobs. 5. I know by the time they come to my house this evening, I (go) out for a walk. 6. I hope they (finish) building the road by the time we come back next summer. 7. By 2020, the number of schools in our country (double). 8. These machines (work) very well by the time you come back next month.

Phương pháp làm:
Các câu hỏi trong bài Chiếm phần lớn liên quan đến thì hiện tại hoàn thành và thì tương lai hoàn thành. Để trả lời các câu hỏi này, chúng ta cần sử dụng các công thức sau:
- By + thời gian + thì tương lai hoàn thành (will have + quá khứ phân từ)
- Thì tương lai hoàn thành: S + will + have + quá khứ phân từ.

Câu trả lời:
1. By the time you arrive, I will have written the essay.
2. By this time tomorrow they will have visited Paris.
3. By the time he intends to get to the airport, the plane will have taken off.
4. By the year 2012 many people had lost their jobs.
5. I know by the time they come to my house this evening, I will have gone out for a walk.
6. I hope they will have finished building the road by the time we come back next summer.
7. By 2020, the number of schools in our country will have doubled.
8. These machines will work very well by the time you come back next month.

4. By the year 2012, many people had lost their jobs.

3. By the time he intends to get to the airport, the plane will have taken off.

2. By this time tomorrow, they will have visited Paris.

1. By the time you arrive, I will have written the essay.