1. It is known that English is an international language./English is known to be an international language.
2. She has heard this song to sing several times.
3. He was seen to steal your car.
4. John is said to be the brightest student in class./ It is said that John is the brightest student in class.
5. Let your book be opened.
6. I was adviced to sell that house. /She adived me that that house should be sold.
7. It is dangerous for the short cut to be taken.
8. He is thought to have died a natural death. /It is thought that he has died a natural death.
9. You won't be let to do that silly thing again.
10. We are ordered to clean the floor. /He orders us that the floor should be cleaned.
11. It must be seen to be believed.
12. It is believed that the earth stood still./The earth is believed to to have stood still.
13. The children are not made to work hard.
14. Don't let that silly thing to be done again.
15. We were begged he should be helped./We were begged to help him.

II

1. is covered
2. Were invited
3. are caused
4. Is being built
5. Wasn't stolen
6. Sacked
7. Was invented
8. Is translated
9. Will be cancelled
10. Will be told
11. Hasn't been used
12. catching
13. Treating