the glasses were broken by nam => some exercise are not being done by the pupil => the mother was cooking dinner at 6 yesterday => the boy had found the key before 9 yesterday =>

Đáp án:

`1.` Nam broke the glasses.

`-` Cấu trúc thì QKĐ(chủ động): S + Ved/V2

`2.` The pupil isn't doing some exercise.

`-` Cấu trúc thì HTTD(chủ động): S + am/is/are + V-ing

`3.` Dinner was being cooked by the mother at 6 yesterday.

`-` Cấu trúc thì QKĐ tiếp diễn: S + was/were + being + PII + (by  O)...

`4.` The key had been found by the boy before 9 yesterday.

`-` Cấu trúc thì QKĐ hoàn thành: S + had + been + PII + (by  o)...

1. the glasses were broken by nam

⇒ Nam broke the glasses.

→ Công thức : thì QKĐ(chủ động): S + `V_ed`/`V_2`

2. some exercise are not being done by the pupil

⇒ The pupil isn't doing some exercise.

→ Công thức : thì HTTD(chủ động): S + am/is/are + `V_ing`

3. the mother was cooking dinner at 6 yesterday

⇒ Dinner was being cooked by the mother at 6 yesterday.

→ Công thức : thì QKĐ tiếp diễn: S + was/were + being + `P_II` + by  O...

4. the boy had found the key before 9 yesterday

⇒ The key had been found by the boy before 9 yesterday.

→ Công thức : thì QKĐ hoàn thành: S + had + been + `P_II` + by  O...