28. Mary's father sent her some money recently.
29. Mozart wrote more than pieces of music
30. Lan took her mother to the airport.
31. You must pay the bill at once.
32. They have already announced the result of the exam.
33. Someone should tell him never to do it again.
34. I think I should tell everybody about it.
35. About thirty million people are watching this programme.
36. Mr. Kent hasn't washed his car for ages.
37. An earthquake has destroyed the whole town.

PASSIVE VOICE.

`28.` Some money was sent to her by Mary's father recently.

`29.` More than pieces of music were written by Mozart.

`30.` Her mother was taken to the airport by Lan.

`31.` The bill must be paid at once.

`32.` The result of the exam has already been announced.

`33.` He should be told never to do it again.

`34.` I think it should be told to everybody about it.

`35.` This programme is being watched by about thirty million people.

`36.` Mr. Kent's car hasn't been washed for ages.

`37.` The whole town has been destroyed by an earthquake.

`-` BD ĐTKT :  S + ĐTKT + be + V3/ed + (by + O)

$28$Mary's father sent her some money recently.

$→$ Mary was sent money recently by her father
$29$Mozart wrote more than pieces of music

$→$ More than pieces of music was written by Mozart

$30$Lan took her mother to the airport.

$→$Lan's mother was taken to the airport 
$31$ You must pay the bill at once.

$→$ The bill must be paid at once
$32$ They have already announced the result of the exam.

$→$ The result of the exam have been announced 
$33$ Someone should tell him never to do it again.

$→$ He should be told  never to do it again
$34$ I think I should tell everybody about it.

$→$ I think everybody should be told about it
$35$ About thirty million people are watching this programme.

$→$ This programme is being watched by about thirty million people
$36$ Mr. Kent hasn't washed his car for ages.

$→$ Mr. Kent's car hasn't been washed for ages
$37$ An earthquake has destroyed the whole town.

$→$The whole town has been destroyed by an earthquake 

$----------------$

$1$Hiện tại đơn

$-$ Active :S + V(s/es) + O

$-$ Passive : S(O) + am/is/are + P2 + by O

$2$Hiện tại tiếp diễn

$-$Active :S + am/is/are + V-ing + O

$-$ Passive : S+ am/is/are + being + P2 + by O

$3$Hiện tại hoàn thành

$-$ Active: S + have/has + P2 + O

$-$ Passive :  + have/has + been + P2 + by  

$4$ Quá khứ đơn

$-$ Active:S + V2 + O

$-$  Passive :S+ was/were +P2 + by  O

$5$ Tương lai đơn

$-$ Active : S + will + V(inf) + O

$-$ Passive : S + will  be +P2 by O

$6$ Model vebs

$-$ Active : S + M.V+ V(inf) + O

$-$ Passive : S + M.V be +P2 by O

* NOTE : Một số chủ ngữ I , you , we , they , she , he , it khi chuyển sang bị động thì có thể bỏ đi 

Ex: by me → có thể bỏ đi

*      NOTE : Các danh từ bất định ( everybody , anyone, .........) bắt buộc hải bỏ khi chuyển sang câu bi động