1 A book was bought (by her) yesterday (buy - bought - bought : mua) 

2 A house was built last year (build - built - built : xây dựng)

3 A lot of money was stolen by Hoa in that bank 5 years ago (steal - stole - stolen : ăn cắp , ăn trộm)

4 The window was broken by a burglar (break - broke - broken : vỡ , phá vỡ)

5 Tom wasn't allowed to take these books home 

6 They weren't taught English (teach - taught - taught : dạy) 

Hoặc : English wasn't taught to them 

7 The lesson was explained by our teacher

* Giải thích : 

- Câu chủ động của thì Quá Khứ Đơn : 

+) S + Ved/V2 

-) S + didn't + V inf 

?) Did + S + V inf ? 

- Câu bị động của thì Quá Khứ Đơn : 

+) S + was/were + Vpp + (by O)

-) S + wasn't/weren't + Vpp + ( by O)

?) Was/were + S + Vpp + ( by O ) ? 

- Note : 

-> Các chủ ngữ I , he , she , we , .... khi chuyển sang câu bị động có thể dùng by + O hoặc lược bỏ 

-> Các chủ ngữ they , human , people , somebody , something , nobody , ... khi chuyển sang câu bị động không được dùng by + O , phải lược bỏ 

`Anwer:`

`1.` A book was bought by her yesterday.

`2.` A house was built last year.

`3.` A lot of money was stolen in that bank by hoa 5 years ago.

`4.` The window was broken by a burglar.

`5.` Tom wasn't allowed to take these books home.

`6.` They weren't taught English.

`7.` The lesson was explained by Our teacher.

`==========`

`+` Cấu trúc câu bị động - thì Quá khứ đơn:

`(+)` KĐ: S + was/were + Ved/V3 + (BY  O)

`(-)` PĐ: S + wasn't/weren't + Ved/V3 + (BY  O)

`(?)` NV: Was/Were + S + Ved/V3 + (BY  O)?