help tui vs Exercise 1: Rewrite these following sentences using passive voice. 1. You must keep the bathroom tidy. 2. You should water this plant daily. . 3. Our neighbour may paint the garage. 4. I must return these books to the library. 5. They must pay their phone bill. 6. You should lock the front door. 7. You must sign these papers. 8. He can play the piano. 9. You ought to put your toys away. 10. We must protect the environment.

`1.` The bathroom must be kept tidy.

`2.` This plant should be watered daily.

`3.` The garage may be painted by our neighbor.

`4.` These books must be returned to the library.

`5.` Their phone bill must be paid.

`6.` The front door must be locked.

`7.` These papers must be signed.

`8.` The piano can be played.

`9.` Your toys ought to be put away.

`10.` The environment must be protect.

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Câu Bị Động `-` Modal verbs :

`-` Must + be P2 (by O) : Phải được làm gì

`-` Should + be P2 (by O) : Nên được làm gì

`-` May + be P2 (by O) : Có thể được làm gì

`-` Can + be P2 (by O) : Có thể được làm gì

`-` Ought to + be P2 (by O) : Phải được làm gì

Exercise 1: Rewrite these following sentences using passive voice.

1. You must keep the bathroom tidy.

=>The bathroom must be kept tidy.

2. You should water this plant daily. 

=>This plant should be watered daily

3. Our neighbour may paint the garage.

=>The garage ought to be paintedby our neighbor

4. I must return these books to the library.

=>These books must be returned to the library 

5. They must pay their phone bill.

=>Their phone must be pay bill.

6. You should lock the front door.

=>The front should be locked door.

7. You must sign these papers.

=>These papers must be signed.

8. He can play the piano.

=>The piano can be played by him.

9. You ought to put your toys away.

=>Your toys ought to be put.

10. We must protect the environment.

=>The environment must be protected.