They believe that the ship has sunk near Alaska. (It...)
It is believed that the ship has sunk near Alaska.
They say that the party was fantastic. (The party...)
The party is said to have been fantastic.
They knew that the expedition reached the North Pole. (It...)
It was known that the expedition reached the North Pole.
People expect that scientists will find a cure for cancer. (Scientists...)
Scientists are expected to find a cure for cancer.
