1. I have heard her sing this song several times.
=> She has been heard to sing this song several times.
2. People saw him steal your car.
=> He was seen to steal your car.
3. She advised me to sell that house.
=> I was advised to sell that house.
3. It is dangerous for us to take the short cut.
=> It is dangerous for the short cut to be taken.
4. He won't let you do that silly thing again.
=> You won't be let to do that silly thing again.
5. He orders us to clean the floor.
=> We are ordered to clean the floor.
6. You must see it to believe it.
=> It must be seen to be believed.
7. People don't make the children work hard.
=> Children aren't made to work hard.
8. Don't do that silly thing again.
=> That silly thing shouldn't be done again.
9. They begged us to help him.
=> We were begged to help him.