1. We waste too much fresh water everyday.

Too much fresh water is wasted everyday.

2. The students are doing an exercise on passive voice at the moment.

An exercise on passive voice is being done by the students at the moment.

3. No one used this computer yesterday.

This computer yesterday.

4. They will build a new hospital in this area.­

A new hospital will be built in this area.­

5. Phu Quang has composed a lot of songs about Ha Noi.­

A lot of songs about Ha Noi have been composed by Phu Quang.

6. We were painting the wall at this time yesterday.

The wall was being painted at this time yesterday.

7. My grandmother named my daughter after a kind of flower.

My daughter was named after a kind of flower by my grandmother.

8. They are decorating their rooms for Tet holiday.

Their rooms are being decorated for Tet holiday.

9. People speak English in many African countries.

English is spoken in many African countries.

10. Nobody informed me about the change of the plan. 

I wasn't informed about the change of the plan.

11. They are going to set up a new workshop in my school.

A new workshop is going to be set up in my school.

12. They gave Linh an Oxford dictionary last semester.

Linh was given an Oxford dictionary last semester.

13. Designers have added many beautiful patterns to the Ao dai.

Many beautiful patterns have been added to the Ao dai by designers.

14. People don't grow maize in this region.

Maize isn't grown in this region.

15. People often use Google or Yahoo website to search for information.

Google or Yahoo website is often used to search for information.

16. They'll send you a letter of invitation soon.

A letter of invitation will be sent to you soon.

17. Mr. Nam is repairing the faucet in the bathroom.

The faucet in the bathroom is being repaired by Mr. Nam.

18. My sister hasn't finished the project yet.

The project hasn't been finished by my sister yet.

19. The workers were repairing the bridge when it collapsed

The bridge was being repaired by the workers when it collapsed.

20. They are going to plant trees in the school garden this weekend.

Trees are going to be planted in the school garden this weekend.

Chuyển thành câu bị động:

1. We shouldn't use too much water everyday

⇒ Water shouldn't be used too much everyday.

2.Lam may not answer your questions
⇒ Your questions may not be answered by Lam.

A computer is used to do that job.

A lot of money was paid to me by her to buy this house.

Books were borrowed by the children from the library yesterday.

The car and the motorbike are washed everyday by her father.

Many exercised were gave to use last week.

The furniture could be fixed by the boy in the kitchen.

The street children in this hall were used to teach by Mai.

A computer is used to do that job.

A lot of money was paid to me by her to buy this house.

Books were borrowed by the children from the library yesterday.

The car and the motorbike are washed by her father everyday.

Many exercised were given to us last week.

The furniture in the kitchen could be fixed by the boy.

The street children in this hall used to be taught by Mai.

Chuyển sang câu bị động

1.We will have a test tomorrow

= > A test will had by we tomorrow

2.I was teaching English at this time yesterday

=> At this time yesterday, English was teached by me

3.My father doesn't drink wine everyday

=> Yesterday, wine doesn't was drank by my father

P/S : Good Luck
~Best Best~

1. A test will be had tomorrow.

2. English was being taught at this time yesterday.

3. Wine isn't drunk by my father every day.

Chuyển sang câu bị động

1.We will have a test tomorrow

-> A test will had by us tomorrow.

2. I was teaching English at this time yesterday

-> At this time yesterday, English was taught by me.

3. My father doesn't drink wine everyday

-> Wine isn't drunk by my father everyday.

1.We waste too much fresh water every day 

\(\Rightarrow\)Too much fresh water is wasted every day..................................................................

2. People speak English all over the world

\(\Rightarrow\).English is spoken by people all over the world..........................................................................

3. They clear their rooms regularly

\(\Rightarrow\).Their rooms is cleared regularly...............................................................................

4. People grow rice for a living here

\(\Rightarrow\)....Rice is grown for a living here............................................................................

Nguyễn Châu Tuấn Kiệt 2.people không cần by

3.their rooms are cleared regularly

6. This dish was brought by the waiter (wait-er)

Chuyển sang câu bị động
1. The teacher punished Tom because of his laziness

-> Tom was punished (by the teacher) because of his laziness.
2. Did Henry sing English songs beautifully?

Were English songs sung beautifully (by Henry)?
3. About thirty million people are watching this programme.

This programme are being watched by about thirty million people.
4. No-one has ever met him before

He hasn't been met (by anyone) ever before.
5. People used oil-lamps years ago

Oil lamps was used (by people) years ago.
6. When did they open that hospital?

 When was that hospital opened (by them)?
7. No-one has made any comments on that event

Any comments haven't been made on that event.
8. What do they call the new hotel?

What is the new hotel called (by them)?
9. We must wash this kind of cloth in warm water only

This kind of cloth must be washed in warm water only.
10. People consume gas faster than they produce it

Gas is consumed faster than produced. 

before the princess arrived at the shipyard, police dogs have been used to make sure no one had hidden any bombs there