=>
5. You should have been given a receipt.
A receipt should have been given to you.
6. He is known to have been in a serious car accident.
It is known that he has been in serious car accident.
7. The new prices were said to be too high.
It was said that the new prices were too high.
8. It is thought that he stole my car.
He is thought to have stolen my car.
9. It was thought that you had gone away.
You were thought to have gone away.