18. I've bought a harp.

-> a harp has been bought (by me).

19. they are delivering it this afternoon.

-> It is delivered (by they) this afternoon.

20. they rang the church bells as a flood warning.

-> the church bells were rung as a flood warning (by them).
21. Someone gives us more information.

->We are gived more information by Someone.

22. People are spending more money on food.

-> More money are spent on food by people.

23. The organizers will exhibit the painting till the end of the month.

-> The painting will be exhibited till the end of the month by the organizers.

24. Someone returns the stolen one.

-> the stolent one is returned by someone.

25. A thief stole my dog.

-> My dog was stolen by a thief.

26. The judge gave him two weeks in which to pay the fine.

-> He was given two weeks in which to pay this fine by the judge.

28. They make these artificial flowers of silk.

->These artificial flowers of silk made (by they)

* Những cái mình đóng ngoặc thì bạn ghi cũng được mà không ghi cũng chẳng sao nha ^.^

*Cấu trúc:

                                        S + V + O

  ->S + trợ động từ + Ved/V3 + (by O).

*Trợ động từ cho các thì:

Thì hiện tại đơn : am/is/are                      Thì hiện tại tiếp diễn:am/is/are being 

Thì hiện tại hoàn thành: have/has been   Thì quá khứ đơn: was/were

Thì tương lai đơn: will be                          Thì tương lai gần: am/is/are going to

 ----Chúc bạn học tốt nha ^,^ ----