Ta có cấu trúc thì QKĐ:

(+) S + be +V2

(-) S + didn't + V-inf

(?) Did + S + V-inf    

1. The safe was locked carefully.

2. The safe is kept in the bedroom on the second floor.

3. Yesterday everything in it was stolen by the thieves.

4. The police were told about it.

5. Everything in the house was checked by the police.

6. Everybody was questioned in the house.

7. The house was surrounded by the police.

8. The police did not think that the thieves were caught.

- By Chee -

`1`. The safe was locked carefully

`2`. The safe is kept in the bedroom on the second floor

`3`. Yesterday everything in it was stolen by the thieves

`4`. The police were told about it

`5`. Everything in the house was checked by the police

`6`. Everybody was questioned in the house

`7`. The house was surrounded by the police

`8`. The police did not think that the thieves were caught

`=>` Sử dụng cấu trúc thì quá khứ đơn 

`(+)` S + V-ed

`(-)`  S + did not + V (nguyên thể)

`(?)`  Did + S + V(nguyên thể) ?

`@thew`