1. The watch was bought at the shop.
2. The house was built in 1950.
3. The exercises were done last week.
4. The letters were sent by the pupils the day before yesterday.
5. The lesson was learnt two weeks ago.
6. Kieu story was written by Nguyen Du.
7. The cake was made last night.
8. The dishes were washed by Daisy last night.
Cấu trúc câu bị động ở thì quá khứ đơn : S + was/were + V(PII) + place + (by + O) + time .
DHNB của câu bị động ở thì quá khứ đơn : khoảng thời gian + ago, có V-ed, last night, last week, last month,....