`1`. This flower is watered by my father every morning.

`2`. Fiona was invited to John's birthday party by him last night.

`3`. The dinner is being prepared in the kitchen by her mother.

`4`. Our teeth should be cleaned twice a day.

`5`. The English grammar has been explained by our teachers.

`6`. The accident was caused in this city by some drunk drivers.

`7`. Tom's parents will be visited by him next month.

`8`. The secretary wasn't phoned by the manager this morning.

`9`. Was this beautiful dress bought by Mary ?

`10`. These old pictures won't be hanged in the living room.

`11`. This factory wasn't bought by the German during the Second World War.

Câu bị động chung: S + to be + PII/Ved + (by + O)

Câu bị động với should: S + should + be + PII/Ved + (by + O)  <câu 4>

Câu bị động cụ thể từng thì (ảnh):