Đáp án:
10. The homework is always done very carefully by these students.
11. Tim hasn't been seen since Monday.
12. That old building is going to be repaired.
13. Is a letter being written by your mother ?
14. How is English learned by you ?
15. Hundreds of houses and buildings were destroyed by the storm.
Giải thích:
Cấu trúc chuyển từ chủ động sang câu bị động chung:
(+) S + V + O.
=> S + be + PII ( + by + O ).
(-) S + TĐT + not + V + O.
=> S + be + not + PII ( + by + O ).
(?) ( W/ H ) + TĐT + S + V + O ?
=> ( W/ H ) + be + S + PII ( + by + O ) ?
* Chú ý:
- Cụm từ chỉ nơi chốn đứng trước "by + O", cụm từ chỉ thời gian ngược lại.
