讲下列问题变成被动语态！高分追加！！！！

1.The company has already built the building.
The building has already been built by the company.

2.They have translated the story into many languages.
The story has been translated into many languages.

3.He said that they would planted the trees.
It was said (by him) that they would planted the trees.

4.He was painting the wall at that time.
The wall was being painted by him at that time.

5.He has finished the work by the end of last week.
The work has (此句及原句似乎had更好) been finished by him by the end of last week

6.You mustn't park your car here.
Your car mustn't be parked (by you) here.

7.Can he finish it in three hours?
Can it be finished by him in three hours?

8.We are sure to punish the murderer.
The murderer is sure to be punished (by us).