Làm ggip tớ đổi câu sang câu bị động Passive

* Tân ngữ by O không xác định, chung chung có thể được lược bỏ

`*` Bị động thì hiện tại đơn :

$(+)$ S + is/am/are + PII ( by O )

$(-)$ S + is/am/are + not + PII ( by O )

`*` Bị động thì quá khứ đơn :

$(+)$ S + was/were + PII ( by O )

$(-)$ S + was/were + not + PII ( by O )

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`24` This room is kept tidy all the time.

`25` The party was voted a great success.

`26` Some bananas and some flowers were given to Ann.

`27` The fridge was moved into the living room.

`28` Some cups of tea were bought to the visitors in the next room.

`29` The new project is found worthless.

`30` The note wasn't taken to the manager by the secretary.