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1. Mary's friends will be seen off at the station by her.

2. That building has to be pulled down. 

3. A knife was given to me to cut this bread by him.

4. Beer used to be drunk in England.

5. 3 shirts a day can be sewed by her. 

6. She is consiedered to be the best singer.

7. This room hasn't been used for ages.

8. An article  is being translated into Vietnamese by me.

9. He was said to have swallowed a safety pin. 

10. I am being followed at the moment. 

Câu bị động: S + to be + PII + O (by sb)

1. Her friends will be seen off at the station by Mary. 

2. That building has to be pulled down. 

3. I was given a knife to cut this bread by him. 

4. Beer used to be drunk in Engand. 

5. 3 shirts a day can be sewed by her. 

6. She is considered to be the best singer.

7. This room hasn't been used for ages.

8. An article is being translated into Vietnamese. 

9. It is said that he had swallowed a safety pin. 

10. I am being followed at the moment.