1. My mother made these dresses.

=> These dresses were made by my mother.

2. His parents made him study for his next exams.

=> He was made to study for his next exams by his parents.

3. They have just introduced a new style of jearns in the USA.

=> A new style of jearns has just been introduced in the USA.

4. The police have just released Fredederic.

=> Fredederic has just been released by the police.

5. They grow rice in tropical countries.

=> Rice is grown in tropical countries.

6. You should take two tablets every four hours.

=> Two tablets should be taken every four hours.

7. My sister gave me a new pair of shoes on my fifteenth birthday.

=> I was given a new pair of shoes by my sister on my fifteenth birthday.

8. The workers are building a supermarket on our street.

=> A supermarket is being built on our street by the workers.

9. The zoo keepers feed the animals twice a day.

=> The animals are fed by the zoo keepers twice a day.

10. They have sold their hotel to pay their debt. 

=> Their hotel has been sold to pay their debt.

11. We are going to grow flowers in the front garden.

=> Flowers are going to be grown in the front garden.

12. You mustn’t use this machine after 5.30 p.m.

=> This machine mustn't be used after 5.30 p.m.

13. My grandmother is knitting a new sweater for me.

=> A new sweater is being knitted for me by my grandmother.

14. Did people make jeans two hundred years ago?

=> Were jeans made two hundred years ago?

15. We don’t use this kind of cloth to make shirts.

=> This kind of cloth isn't used to make shirts.

16. Vietnamese women continue to wear the unique and fashionable Ao dai.

=> The unique and fashionalble Ao dai is continued to wear by Vietnamese women.

17. This old man always helps the poor children.

=> The poor children are always helped by this old man.

18. We haven’t met Jane since we left for the city.

=> Jane hasn't been met since we left for the city.

19. We call this dog Kiki.

=> This dog is called Kiki.

20. You should open the wine about three hours before you use it.

=> The wine should be opened about three hours before you use it.

21. My friend, John, can answer these English questions.

=> These English questions can be answerred by my friend, John.

22. Mrs. Green is watering the flowers in the garden now.

=> The flowers are being watered in the garden by Mrs. Green now.

23. He bought a new mobile phone two weeks ago.

=> A new mobile phone was bought by him two weeks ago. 

24. You will know the result of the graduation examination in a week.

=> The result of the graduation examination will be known in a week.

25. She was cooking dinner when we dropped in to see her.

=> Dinner was being cooked when we dropped in to see her.

26. Are you watching a new cartoon on TV?

=> Is a new cartoon being watched on TV?

27. Did you meet your grandparents at the station last Sunday?

=> Were your grandparents met at the station last Sunday?

28. These students haven’t written the compositions yet.

=> The compositions haven't been written by these students yet.

29. Has your elder brother watched this play several times?

=> Has this play been watched by your elder brother several times?

30. When will they pull this old building down?

=> When will this old building be pulled down?

31. Why didn’t you invite Kate to the party last month?

=> Why wasn't Kate invited to the party last month?

32. Her parents always encourage her to focus on her study.

=> She is always encouraged to focus on her study by her parents.

33. The sudden flood damaged our crops.

=> Our crops were damaged by the sudden flood.

34. Have you ever met this movie star?

=> Has this movie star ever been met?

35. Will you phone her when she comes to London?

=> Will she be phoned when she comes to London?

1. My mother made these dresses.

=> These dresses were made by my mother.

2. His parents made him study for his next exams.

=> He was made to study for his next exams by his parents.

3. They have just introduced a new style of jearns in the USA.

=> A new style of jearns has just been introduced in the USA.

4. The police have just released Fredederic.

=> Fredederic has just been released by the police.

5. They grow rice in tropical countries.

=> Rice is grown in tropical countries.

6. You should take two tablets every four hours.

=> Two tablets should be taken every four hours.

7. My sister gave me a new pair of shoes on my fifteenth birthday.

=> I was given a new pair of shoes by my sister on my fifteenth birthday.

8. The workers are building a supermarket on our street.

=> A supermarket is being built on our street by the workers.

9. The zoo keepers feed the animals twice a day.

=> The animals are fed by the zoo keepers twice a day.

10. They have sold their hotel to pay their debt. 

=> Their hotel has been sold to pay their debt.

11. We are going to grow flowers in the front garden.

=> Flowers are going to be grown in the front garden.

12. You mustn’t use this machine after 5.30 p.m.

=> This machine mustn't be used after 5.30 p.m.

13. My grandmother is knitting a new sweater for me.

=> A new sweater is being knitted for me by my grandmother.

14. Did people make jeans two hundred years ago?

=> Were jeans made two hundred years ago?

15. We don’t use this kind of cloth to make shirts.

=> This kind of cloth isn't used to make shirts.

16. Vietnamese women continue to wear the unique and fashionable Ao dai.

=> The unique and fashionalble Ao dai is continued to wear by Vietnamese women.

17. This old man always helps the poor children.

=> The poor children are always helped by this old man.

18. We haven’t met Jane since we left for the city.

=> Jane hasn't been met since we left for the city.

19. We call this dog Kiki.

=> This dog is called Kiki.

20. You should open the wine about three hours before you use it.

=> The wine should be opened about three hours before you use it.

21. My friend, John, can answer these English questions.

=> These English questions can be answerred by my friend, John.

22. Mrs. Green is watering the flowers in the garden now.

=> The flowers are being watered in the garden by Mrs. Green now.

23. He bought a new mobile phone two weeks ago.

=> A new mobile phone was bought by him two weeks ago. 

24. You will know the result of the graduation examination in a week.

=> The result of the graduation examination will be known in a week.

25. She was cooking dinner when we dropped in to see her.

=> Dinner was being cooked when we dropped in to see her.

26. Are you watching a new cartoon on TV?

=> Is a new cartoon being watched on TV?

27. Did you meet your grandparents at the station last Sunday?

=> Were your grandparents met at the station last Sunday?

28. These students haven’t written the compositions yet.

=> The compositions haven't been written by these students yet.

29. Has your elder brother watched this play several times?

=> Has this play been watched by your elder brother several times?

30. When will they pull this old building down?

=> When will this old building be pulled down?

31. Why didn’t you invite Kate to the party last month?

=> Why wasn't Kate invited to the party last month?

32. Her parents always encourage her to focus on her study.

=> She is always encouraged to focus on her study by her parents.

33. The sudden flood damaged our crops.

=> Our crops were damaged by the sudden flood.

34. Have you ever met this movie star?

=> Has this movie star ever been met?

35. Will you phone her when she comes to London?

=> Will she be phoned when she comes to London?