People know that she is a good swimmer.
- It is known that she is a good swimmer.
- She is known to be a good swimmer.

They say that Francis is in hospital.
- It is said that Francis is in hospital.
- Francis is said to be in hospital.

They think that the children are in bed.
- It is thought that the children are in bed.
- The children are thought to be in bed.

People believe that the robber has worked in the bank.
- It is believed that the robber has worked in the bank.
- The robber is believed to have worked in the bank.

People believe that nuclear power stations are dangerous.
- It is believed that nuclear power stations are dangerous.
- Nuclear power stations are believed to be dangerous.

His colleagues thought that he was on holiday.
- It was thought that he was on holiday.
- He was thought to be on holiday.

People know that cars pollute the environment.
- It is known that cars pollute the environment.
- Cars are known to pollute the environment.

They suppose that the new product will come out soon.
- It is supposed that the new product will come out soon.
- The new product is supposed to come out soon.

They believe that she will win a gold medal.
- It is believed that she will win a gold medal.
- She is believed to win a gold medal.