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.

Chào bạn! Chúc bạn học tốt! ^^

1. This song has been heard to sing several times by her

2, He was seen to steal your car

3. I was advised to sell that house by her

3. It is dangerous for the short cut to be taken

4. You won't be let to do that silly thing again

5. We are ordered to clean the floor by him

6. It must be seen to believe it

7. The children aren't made to work hard

8. That silly thing isn't done again

9. We are begged to help him by them