=>>
Ex2/
1. The girl was sent a letter.
A letter was sent to the girl.
2. Her friends are being shown the new computer.
The new computer is being shown to her friends.
3. The girl is often told tale stories by her mother.
Tale stories are often told to the girl by her mother.
4. You will be paid 500 by them.
500 will be paid to you by them.
Ex3/
1. This new teaching method is believed to be more effective than the old one.
It is believed that this new teaching method is more effective than the old one.
2. Some solutions are expected to be made.
3. Climbing is thought to be a dangerous sport.
It is thought that climbing is a dangerous sport.
4. The towers are rumoured to have been built very long ago.
5. The cat is said to like catching big mice.
It is said that the cat likes catching big mice.
6. The soldiers are said to have surrendered to the enemy.
7. The man is known to put up with his wife too much. 
It is said that the man put up with his wife too much.