change the active into the passive 

` 14`. This room is kept tidy by them all the time.

` -` Bị động HTĐ : S + is/are + V-ed/V3 + (by ...) + ...

` 15`. The party was voted a great success by them.

` -` Bị động QKĐ : S + was/were + V-ed/V3 + (by ...) + ...

` 16`. Ann was given some bananas and some flowers by us.

` -` Bị động QKĐ : S + was/were + V-ed/V3 + (by ...) + ...

` 17`. The fridge was moved into the living room by them.

` -` Bị động QKĐ : S + was/were + V-ed/V3 + (by ...) + ...

` 18`. The visitors in the next room were bought some cups of coffee by her.

` -` Bị động QKĐ : S + was/were + V-ed/V3 + (by ...) + ...

` 19`. The new project is found worthless by them.

` -` Bị động HTĐ : S + is/are + V-ed/V3 + (by ...) + ...

` 20`. The poem is written by who?

` -` Bị động HTĐ : S + is/are + V-ed/V3 + (by ...) + ...

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 by us.

17 The fridge was moved into the living room.

18 Some cups of tea were bought for the visitors in the next room.

19 The new project is found worthless.

20 Who was the poem written by?

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* Bị động

- Hiện tại đơn: S + am/is/are + V3/ed + (by O).

- Tương lai đơn: S + will be + V3/ed + (by O).

- Quá khứ đơn: S + was/were + V3/ed + (by O).