`10` While the computer was being tried to fix , all the lights went out

`-` Bị động thì QKTD : S + was/were + being + Vpp + ( by O ) 

`-` The computer là chủ ngữ số ít `->` chia was

`11` The books are being sold at a lower price

`-` Bị động thì HTTD : S + is/am/are + being + Vpp + ( by O ) 

`-` The books là số nhiều `->` chia are

`12` Four letters have been sent to him so far

`-` Bị động thì HTHT : S + has/have + been + Vpp + ( by O ) 

`-` Four letters là số nhiều `->` chia have

`13` The incident is investigated by the police

`-` Bị động thì HTĐ : S + is/am/are + Vpp + ( by O) 

`-` The incident là số ít `->` chia is

`14` Has the present been received yet ? 

`-` Bị động thì HTHT : Has/have + S + been + Vpp + ( by O ) ?

`-` The present là số ít `->` chia has

`15` A violin is being taken by Miss Clara next Wednesday 

`-` Bị động thì HTTD : S + is/am/are + being + Vpp + ( by O ) 

`-` A violin là số ít `->` chia is 

`@` Note : Nếu chủ ngữ ở câu chủ động không xác định rõ ràng như someone , somebody , people , ... thì khi chuyển sang câu bị động không cần dùng by O 

10. While the computer was being tried to fix, all the lights went out.

(Bị động thì QKTD: was/ were + PII)

11. The books are being sold at a lower price.

(Bị động thì HTTD: is/ am/ are +being+ PII)

12. Four letters have been sent to him so far.

(Bị động thì HTHT: has/ have + been + PII)

13. The incident is being investigated by the police.

(Bị động thì HTTD)

14. Has the present been received yet?

(Bị động thì HTHT)

15. A violin class is being taken by Miss Clara next Wednesday.

(Bị động thì HTTD)