1.They find the new project worthless.

=>The new project is found worthless.

2.The committee appointed Alice secretary for the meeting

=>Alice was appointed secretary for the meeting(by the committee).

3.They all voted the party a great success

=>The party was voted a great success(by them)?

4.she left her relatives five million pounds

=>Five million pounds was left to her relatives(by her)

5,Have you send the christmas cards to your family?

=>Have the christmas cards been send to your family?

=>The new project is found worthless.

2.The committee appointed Alice secretary for the meeting

=>Alice was appointed secretary for the meeting by the committee .

3.They all voted the party a great success

=>The party was voted a great success ?

4.she left her relatives five million pounds

=>Five million pounds was left to her relatives by her

5,Have you send the christmas cards to your family?

=>Have the christmas cards been sent to your family?

11. Have the christmas cards been sent to your family?
12. Alice secretary was appointed for the meeting by the committee.

13. The broken cup is hidden in the drawer.
14. This room is kept tidy all the time.
15. The party was voted a great success.
16. Ann was given some bananas and some flowers.
17. The fridge was moved into the living room.
18. Some cups of tea were bought to the visitors in the next room.
19. The new project is found worthless.
20. The note was taken to the manager by the secretary.

1. Have the Christmas cards been sent to your family?

2. Alice secretary was appointed for the meeting by the committee

3. The broken cup is hidden in the drawer

4. This room is kept tidy all the time

5. The party was all voted a great success

6. Ann was given some bananas and some flowers

7. The fridge was moved into the living room

8. Some cups of tea were bought to the visitors in the next room

9. The new project is found worthless

10. The note wasn't taken to the manager by the secretary

The committee appointed Alice secretary for the meeting.

 Alice secretary .was appointed for the meeting...

  Their grandmother told them this story when they visited her last week.

They .was told this story by their grandmother when they visited her last week. ..

They .were told this story by their grandmother when they visited her last week. 

chuyển sang câu bị động:

1. Have you sent the christmas cards to your family?

have the christmas cards been sent to your family?

2. The committee appointed Alice secretary for the meeting.

Alice secretary was appointed by the committee for the meeting

3. He hides the broken cup in the drawer.

the broken cup is hided in the drawer

4. They keep this room tidy all the time.

this room is kept tidy all the time

5. They all voted the party a great success.

the party was voted a great success by them

1. Have the christmas cards been sent to your family?

2. Alice was appointed secretary for the meeting by the committee.

3. The broken cup is hidden in the drawer by him.

4. This room is kept tidy by them all the time.

5. The party was voted a great success by them.

Chuyển sang câu bị động các câu sau:

1. Our English teacher may give an exam to day.

→ The exam may be given by our English teacher today.

2. You may forget the rules quickly.

→ The rules may be forgotten by you quickly.

3. Janet used to study the lessons repeatedly.

→ The lessons used to be studied repeatedly by Janet.

4.Ben must win the competition.

→ The competition must be won by Ben.

5.The doctor can't persuade her.

→ She can't be persuaded by the doctor.

6. The students have to learn History.

→ History has to be learned by the students.

7. Tom must open the window.

→ The window must be opened by Tom.

8. How can we solve that problem?

→ How can that problem be solved by us?

9. You must not touch this button during the experiment.

→ This button must not be touched by you during the experiment.

10. We should call the police at once after the accident.

→ The police should be called at once by us after the accident.

11. You shouldn't make fun of the poor.

→ The poor shouldn't be made fun of by you.

12. My sister used to open a shop 3 years ago.

→ A shop used to be opened by my sister 3 years ago.

13. We have to end this quarrel.

→ This quarrel has to be ended by us.

14. You ought to help her.

→ She ought to be helped by you.

15. You must keep the secret forever.

→ The secret must be kept by you forever.

Bạn ơi còn on không ạ mình có câu hỏi này ấy ạ

4. A new bridge near my house will be built next year.
5. The road to our village will be widened.
6. The meeting will be held before May Day.
7. A new computer will be bought by Jane.
8. The museum will be visited by millions of people.
9. The contract will be signed by our boss.
10. Public transport will be used by students to go to school.
11. A great deal of electricity will be generated by solar power this summer.
12. Plants won't be burned by local people to heat this winter.
13. The air will be polluted by the smoke from factories.
14. A hydro power station will be built in this area.
16. The grass will be cut by the gardeners tomorrow.