`1,` Heavy work shouldn't be done by children.

`2,` The timetable for the trip may be changed.

`3,` These exercises must be finished by all the students by Friday.

`4,` Does an English song have to be sung by him before the whole school?

`5,` This machine used to be operated by hand.

`6,` Cloth bags will be used by people in the future.

`7,` You will be met at the station by my cousin.

`8,` The meeting will be held before May Day.

`9,` Will she be invited to your wedding party?

`10,` Life on another planet might be found.

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Giải thích: 

`-` Câu bị động của tương lai đơn: 

(`+`) S `+` will `+` be `+` V3/V-ed.. (by `+` O) 

(`-`) S `+` won't be `+` V3/V-ed.. (by `+` O) 

(`?`) Will `+` S `+` be `+` V3/V-ed.. (by `+` O) ?

`-` Câu bị động của đtkt: S `+` đtkt(must/can/..) `+` be `+` V3/V-ed…(by `+` O)

${\text{Lưu ý: }}$

`+` Các đại từ bất định như somebody, nobody, people,..  không dùng by + O

1. Children shouldn't do heavy work.

Heavy work shouldn't be done (by the children).

2. They may change the timetable for the trip. 

The timetable may be changed for the trip.

3. All the students must finish these exercises by Friday. 

These exercises must be finished by all the students by Friday

4. Does he have to sing an English song before the whole school? 

Was an English song had to be sung before the whole school?

5. People used to operate this machine by hand. 

This machine used to be operated by hand.

6. People will use cloth bags in the future. 

Cloth bags will be used in the future.

7. My cousin will meet you at the station. 

You will be met at the station by my cousin.

8. They will hold the meeting before May Day. 

The meeting will be held before May Day.

9. Will you invite her to your wedding party? 

Will she be invited to your wedding party?

10. We might find life on another planet

Life might be found on another planet.

*Cấu trúc câu bị động:

Câu chủ động: S + V + O...
Câu bị động: S + be (V chia thì gì 'be' chia thì đó) + V(past participle) + (by + O)....

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$\text{~ Chúc b học tốt ạ ~}$