Ngữ Pháp:

+) Have to do st -> St have to be done: phải làm gì

+)

=> bị động: S + can't + be + P2

+) It's necessary to + Vinf

--> bị động: S + should/ must + be +P2

27. You have to finish this work today

=> This work have to be finished today.

28.They are having to dig a big hole

=> A big hole is having to be digged.

29.People say that he is a spy

=> He is said to be a spy.

30.People think that the rich are not always happy

=> It is thought that the rich are not always happy.

31.It's possible to purify this water

=> This water can be purified.

32.It*s impossible to replace him

=> He can't be replaced.

33.It*s essential to send this letter by airmail

=> This letter must be sent by airmail.

34.It*s nessesary to keep your feet warm

=> Your feet should be kept warm.

3.It*s unnessary to learn the poem by heart

=> The poen shouldn't be learnt by heart.

Turn these sentences into passive voice:

1.People were telling me what to do all the time and I didn't enjoy it.

I WAS BEING TOLD WAHT TO DO ALL THE TIME AND I DIDN'T ENJOY IT.

2. He wants people to call him sir

HE WANTS TO BE CALLED SIR.

3. We believe that he has special knowledge

HE IS BELIEVED TO HAVE SPECIAL KNOWLEDGE.

4. People think she is the most beautiful girl

SHE IS THOUGHT TO BE THE MOST BEAUTIFUL GORL.

5. People say he is very rich

HE IS SAID TO BE VERY RICH.

6. People believe that he was the first man to land on the moon

HE IS BELIEVED TO HAVE BEEN THE FIRST MAN TO LAND ON THE MOON.

7. They say that Jenny is the brightest student in the class

JENNY IS SAID TO BE THE BRIGHTEST STUDENT IN THE CLASS.

I. Change the following sentencs into passive voice.
1. Find all of the books you need

=> Find all of the books are need by you
2. I'd love someone to take the children out for a walk.

=> I'd love the children are taken out for a walk
3. He decided to sell the house.

=> The house was drcided to sell by him
4. It's time someone told him what is wrong.

=> It's time he is told what is wrong
5.He won't let you do that silly thing again.

=> You won't be let do that silly thing again by him

7. What did they pay you for doing the job?

=> What were you paid for doing the job ?
8. They aren't going to buy anything tomorrow.

=> Anything isn't going to be bought tomorrow
9. They've made effort to solve the plroblem

=>The problem has been made effort to solve by them

TK

1. I am always given proper encouragement by parents
2. I remember being given a toy drum on my 5th birthday
3. He was seen pick up the gun
4.I was asked some difficult questions at the interview by them
5.this switch mustn't been not touched
6. You won't be let to do that silly thing again by him
7.You will be sent a coppy of the sales contract by the real estate office
8.the wasn't expected to find my car by me
9.I rarely hear her children to be called bad names by her
10.a terrible mistake had seem to have made

11. Tom should have been offered the job.
12. Arthur is said to have robbed  a bank a long time ago
13. Little boys used to be made to climb the chimneys to clean them
14. The sale of alcohol at football matches is suggested banning 
15. Your coat must be taken off
16. That money has been sent to the poor families
17. Bullet-proof glass was recommended using (by him)

Exercise for passive voice: special structures

11.The detective is watching them talking

They are being watched talking by the detective.

12.They let him do whatever he liked

He was let to do whatever he liked.

13.They won*t let you go in without an invitation

You won't be let to go in without an invitation.

14.Don't let anyone read this letter

Don't let this letter be read .

15.He let his assistant deal with this matter

His assistant was let to deal with this matter.

16I won*t let anyone tough this

Noone will be let to tough this.

You are supposed to obey him.

1. You are supposed to obey him
2. Yogurt is thought to do you good
3.it is believed that swimming is good for your health
4. it is thought that exercise do us good
5. Drinking alcohol is bad for us( mình k chắc)
6. You are supposed to be on time
7. You weren't wanted to be hare
8.This flight is expected to be on time
9. His parents is supposed to help with housework
10. The train is wanted to arrive at 6:00

Change these sentences into passive voice

1. He dicided to sell the house

=>He decided that the house should be sold.

2. They advice giving up smoking

=>They advise that smoking should be given up.

3. She needs to water the flowers

=>The flowers need watering

4. All of us think that she is the most intelligent girl in class

=>She is thought to be the most intelligent Girl in class.

5. They let him know the truth

=>He is let to know the truck.

6. The teacher had his pupils bring all the chairs in

=>The teacher had all the chairs brought in.

7. It is your duty to help him in his study

=>You are supposed to help him in his study.