16. We will not admit children under

=>16. Children under 16 will not be admitted.

17. You shouldn't leave the documents on the desk.

=>17. The documents shouldn't be left on the desk.

18. They are going to open a new school here next month.

=>18. A new school is going to be opened here next month.

19. The police shouldn't allow people to park there.

=>19. People shouldn't be allowed to park there by the police.

20. People mustn't leave bicycles in the hall.

=>20. Bicycles mustn't be left in the hall.

21. Sarah was writing a letter when I came.

=>21. A letter was being written by Sarah when I came.

22. They are building a new ring road round the city.

=>22. A new ring road is being built round the city.

23. The manager must sign the cheque.

=>23. The cheque must be signed by the manager.

24. John will meet me at the airport.

=>24. I will be met at the airport by John.

25. They have built a new hospital near the airport.

=>25. A new hospital will be built near the airport.

26. They think that this book is of no use.

=>26. It is thought that this book is of no use.

27. People believe that he was injured in the accident

=>27. It is believed that he was injured in the accident.

28. They say many people are homeless after the floods.

=>28. It is said that many people are homeless after the floods.

29. We believe that he is studying painting in America.

=>29. It is believed that he is studying painting in America.

30. People think that he knows English well. 

=>30. It is thought that he knows English well.

Công thức câu bị động :

S2 + tobe + PII

@Dịu gửi bạn 

Chúc bạn học tốt !

16. Children under 16 will not be admitted.

17. The documents shouldn't be left on the desk.

18. A new school is going to be opened here next month.

19. People shouldn't be allowed to park there by the police.

20. Bicycles mustn't be left in the hall.

21. A letter was being written by Sarah when I came.

22. A new ring road is being built round the city.

23. The cheque must be signed by the manager.

24. I will be met at the airport by John.

25. A new hospital will be built near the airport.

26. It is thought that this book is of no use.

27. It is believed that he was injured in the accident.

28. It is said that many people are homeless after the floods.

29. It is believed that he is studying painting in America.

30. It is thought that he knows English well.