1. They think that she knows the truth.
  2. People say that he is a genius.
  3. They believe that the project will be successful.
  4. Everyone knows that she is an excellent teacher.
  5. They expect that the meeting will start on time.
  6. People claim that he was involved in the scandal.
  7. They think that the new law will help the economy.
  8. People say that the movie is very good.
  9. They believe that the earth is getting warmer.
  10. Everyone knows that smoking is harmful.
  11. They report that the situation is under control.
  12. People think that he is hiding something.
  13. They assume that she will win the competition.
  14. People say that the book is a bestseller.
  15. They expect that she will arrive soon.
  16. People claim that the painting is worth millions.
  17. They think that he has already left the country.
  18. Everyone believes that she is telling the truth.
  19. They say that he invented the device.
  20. People expect that the product will be released next month.

Answers

  1.   It is thought that she knows the truth.
      She is thought to know the truth.

  2.   It is said that he is a genius.
      He is said to be a genius.

  3.   It is believed that the project will be successful.
      The project is believed to be successful.

  4.   It is known that she is an excellent teacher.
      She is known to be an excellent teacher.

  5.   It is expected that the meeting will start on time.
      The meeting is expected to start on time.

  6.   It is claimed that he was involved in the scandal.
      He is claimed to have been involved in the scandal.

  7.   It is thought that the new law will help the economy.
      The new law is thought to help the economy.

  8.   It is said that the movie is very good.
      The movie is said to be very good.

  9.   It is believed that the earth is getting warmer.
      The earth is believed to be getting warmer.

  10.   It is known that smoking is harmful.
      Smoking is known to be harmful.

  11.   It is reported that the situation is under control.
      The situation is reported to be under control.

  12.   It is thought that he is hiding something.
      He is thought to be hiding something.

  13.   It is assumed that she will win the competition.
      She is assumed to win the competition.

  14.   It is said that the book is a bestseller.
      The book is said to be a bestseller.

  15.   It is expected that she will arrive soon.
      She is expected to arrive soon.

  16.   It is claimed that the painting is worth millions.
      The painting is claimed to be worth millions.

  17.   It is thought that he has already left the country.
      He is thought to have already left the country.

  18.   It is believed that she is telling the truth.
      She is believed to be telling the truth.

  19.   It is said that he invented the device.
      He is said to have invented the device.

  20.   It is expected that the product will be released next month.
      The product is expected to be released next month.