Đáp án:
VIII - 1. Our exercises are corrected at home by the teacher.
2. His mother was worried by Ali's absence.
3. Several new schools are being building in our town.
4. Great progress has been made in industry, science and medicine.
5. A lion was killed by Sam last week.
6. Your report must be handed in before the end of this month.
7. The job had just been finished when the factory closed.
8. That box has been opened for the past hundred years.
9. Are these letters going to be mailed soon?
10. The report should be finished yesteday.
11. Meals are cooked by my sister every day.
12. The floor was cleaned by my mother yesterday.
13. Ten emails have been written by my friend for 2 hours.
14. Our house is being painted by my father.
15. Some food was being bought by my sister at 11 a.m yesterday.
16. A pencil is used to draw beautiful pictures by my brother.
17. Their work had been finished before you came yesterday.
18. You will be called if there is any important imformation.
IX - 1. was repaired
2. will be bought
3. are being watered
4. has been learned/ learnt
5. was watched
6. has been read
7. was stolen
8. was broken
Giải thích các bước giải:
VIII. Công thức tổng quát chuyển từ chủ động sang bị động:
CĐ: S + V + O.
$\to$ BĐ: S(O) + be + PII (+ by + O).
- Động từ "be" được chia theo thì của động từ trong câu chủ động.
- Cụm từ chỉ nơi chốn đứng trước "by + O".
- Cụm từ chỉ thời gian đứng sau "by + O".
IX - 1. yesterday $\to$ QKĐ
2. next month $\to$ TLĐ
3. now $\to$ HTTD
4. for 3 months $\to$ HTHT
5. yesterday $\to$ QKĐ
6. three times $\to$ HTHT
7. yesterday $\to$ QKĐ
8. last night $\to$ QKĐ
Mà trong 8 câu trên chủ thể không thể tự thực hiện hành động
$\to$ Đều được chia ở thể bị động (Passive Voice).
