19/ People saw her driving a car near the bridge.

She was seen to drive a car near the bridge.

21/ Scientists began to carry out researches on AIDS in 1981.

Researches on AIDS began to be carried out by scientists in 1981

23/ Everybody believed that he had died of lung cancer.

It was believed that he had died of lung cancer.

24/ They hadn’t built the bridge when we first came here.

The bridge hadn't been built when we first came here.

PASSIVE VOICE

Change into passive voice.

1. The teacher corrects our exercises at home.

-> Our exercises at home are corrected by the teacher.

2. Alice gave me a wonderful present.

-> I was given a wonderful present by Alice.

3. They are building several new schools in our town.

-> New schools are being built several in our town by them.

4. We have made great progress in industry, science and medicine.

-> Great progress has been made in industry, science and medicine.

5. Sam killed a lion last week.

-> A lion was killed by Sam last week.

6. You must hand in your report before the end of this month.

-> Your report must be handed in before the end of this month.

7. I had just finished the job when the factory closed.

-> The job has just been finished when the factory closed.

8. No one has opened that box for the past hundred years.

-> That box has been opened for the past hundred years.

9. Are you going to mail these letters soon?

-> Are these letters going to be mailed soon?

10. He should have finished the report yesterday.

-> The report should have been finished yesterday.

11. Scientists began to carry out researches on SIDA two years ago.

-> Researches on SIDA were begun to carry out by scientists two years ago.

12. They say that he is the richest man in our town.

-> He is said to be the richest man in our town.

13. I can assure you I will arrange everything in time.

-> You can be assured everything will be arranged in time.

14. We are to pity rather than despise these homeless boys.

-> We are to pity rather than these homeless boys are despised.

15. We haven’t moved anything since they sent you away to cure you.

-> Nothing has been moved since they sent you away to cure you.

Passive voice

3. They are building several new schools in our town.

-> Several new schools are being built in our town.
8. No one has opened that box for the past hundred years.

-> That box hasn't been opened for the past hundred years.
11. Scientists began to carry out researches on SIDA two years ago.

-> Researches on SIDA began to be carried out by scientists two years ago.
12. They say that he is the richest man in our town.

-> He is said to be the richest man in our town.
13. I can assure you I will arrange everything in time.

-> You can be assured everything will be arranged in time.
14. We are to pity rather than despise these homeless boys.

-> These homeless boys are to be pitied rather than to be despised.
15. We haven’t moved anything since they sent you away to cure you.

-> Nothing has been moved since you were sent away to be cured.

1. Christmas songs were performed for people in town
2. Children were given presents on Christmas Eve by Santa Clause
3. Liz was invented to the rice by Ba
4. The festival was held in the communal house yard
5. Our house is painted by us every three years
6. The boy knew that he was being praised 
7. I haven't ever been asked that question before
8. The first prize was awarded to the Mekong team by the council leader

Researches on COVID-19 began to be carried out by scientists in 2020

researches on COVID-19 began to be carried out by scientists in 2020

Scientists began to carry out researches on COVID-19 in 2020.

=> Researches on COVID-19 began to be carried out by scientists in 2020.

* Đây là câu cần chuyển thành bị động.

I. Change into the Passive voice.
1. We paint our house every three years.

\(\Rightarrow\) Our house is painted every three years.

2. Years ago, people you oil lamps instead of electric lamps.

\(\Rightarrow\) Years ago, oil lamps were used instead of electric lamps.

3. They’re building several new shools in our town.

\(\Rightarrow\) Several new schools are being built in our town.

4. The boy knew that they were praising him.

\(\Rightarrow\) The boy knew that he was being praised.

5. We have set up a committee to investigate the matter.

\(\Rightarrow\) A committe has been set up to investigate the matter by us.

6. I noticed that they had not yet taken the wrecked car away.

\(\Rightarrow\) I noiced that the wrecked car had not yet been taken away.

7. Can we you an Indifinte Article before an uncountable noun?

\(\Rightarrow\) Can an Indifinte Article be used before an uncountable noun by us?

8. Someone must have dropped this watch in his hurry.

\(\Rightarrow\) This watch must have been dropped in his hurry.

9. They promised the workers higher wages.

\(\Rightarrow\) The workers were promised higher wages.

10. No one has ever asked me that question before.

\(\Rightarrow\) I have never been asked that question before.

I. Change into the Passive voice.
1. Our house is painted every three years.

3. Several new schools are being built in our town.

4. The boy knew that he was being praised.

5. A committe has been set up to investigate the matter by us.

6. I noiced that the wrecked car had not yet been taken away.

7. Can an Indifinte Article be used before an uncountable noun by us?

8. This watch must have been dropped in his hurry.

9. The workers were promised higher wages.

10. I have never been asked that question before.

 Change into the Passive voice.
1. We paint our house every three years.

\(\Rightarrow\) Our house is painted every three years.

2. Years ago, people you oil lamps instead of electric lamps.

\(\Rightarrow\) Years ago, oil lamps were used instead of electric lamps.

3. They’re building several new shools in our town.

\(\Rightarrow\) Several new schools are being built in our town.

4. The boy knew that they were praising him.

\(\Rightarrow\) The boy knew that he was being praised.

5. We have set up a committee to investigate the matter.

\(\Rightarrow\) A committe has been set up to investigate the matter by us.

6. I noed that they had not yet taken the wrecked car away.

\(\Rightarrow\) I noiced that the wrecked car had not yet been taken away.

7. Can we you an Indifinte Arle before an uncountable noun?

\(\Rightarrow\) Can an Indifinte Arle be used before an uncountable noun by us?

8. Someone must have dropped this watch in his hurry.

\(\Rightarrow\) This watch must have been dropped in his hurry.

9. They promised the workers higher wages.

\(\Rightarrow\) The workers were promised higher wages.

10. No one has ever asked me that question before.

\(\Rightarrow\) I have never been asked that question before.

Chuyển các câu với động từ tường thuật sau sang câu bị động
1.They think that he has died a natural death

=>it is thought that he has died a natural death
2.Some people believe that 13 í an unlucky number

=>it is believed that 13 is an unlucky number
3.They say that John is the brightest student in class

=>it is said that John is the brightest student in class
4.They reported that the President had suffered a heart attack

=>it was reported that the President had suffered a heart attack
5.I knew that they had told him of the meeting

=>it was known that they had told him of the meeting
6.They declared that she won the competition

=>it was declared that she won the competition
7.They rumored te man was still living

=>it was rumored that man was still living
8.People think that Jack London's life and writing's represent the American love of adventure

=>it is thought that Jack London's life and writing's represent the American love of adventure
9.They reported that the troops were coming

=>it was reported that the troops were coming
10.People believed that the earth stood still

=>it was believed that the earth stood still