13.The lesson is explained by the teacher.

14.The food is being cooked by Mrs Green in the kitchen.

15.The patients were examined by the doctor.

16.That noise was made by these boys.

17.English is spoken all over the world.

18.The money was given back last sunday.

19.These exercises can't be done quickly.

20.Should Jane be helped with the sewing?

21.Judy's car is being repaired by the mechanic.

22.Something must be done before it's too late.

23.These artifical flowers of silk are made.

24.Was your dog fed last night?

-----------------------------------------------------------------

Cấu trúc câu bị động :

- Thì HTĐ: S + V (s/es)

           => S + be + VpII + (by O)

-Thì HTTD: S + be + V-ing

           => S + be + being + VpII + (by O)

-Thì QKĐ: S + V(quá khứ)

           => S + be + VpII + (by O)

Công thức - bị động:

- Thì HTĐ: S + am/is/are + V3/ed 

- Thì HTTD : S + am/is/are + being + V3/ed 

- Thì QKĐ:

(+) S + was/were + V3/ed 

(?) Was/Were +S +V3/ed?

- S + can be + V3/ed 

- Should + S +be V3/ed ?

- S + must be + V3/ed

--------------------------------------------------------------------

13. The lesson is explained by the teacher.

14. The food is being cooked in the kitchen by Mrs. Green.

15. The patients were examined by the doctor.

16. That noise was made by these boys.

17. English is spoken all over the world.

18. He was given back the money last Sunday.

19. These exercises can't be done quickly.

20. Should Jane be helped with the sewing?

21. Judy's car is being repaired by the mechanic.

22. Something must be done before it's too late.

23. These artificial flowers are made of silk.

24. Was your dog fed last night?

`color{orange}{~LeAiFuRuiHuiBao~}`