`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