1. They told the new pupil where to sit
->they new pupil was told where to sit
2. I know that they had told him of the meeting
->i know that he has been told him of the meeting
3. Nobody has ever treated me with such kindness
->i have never treated with such kindness
4. No one believes his story
->his story isn't believed by anyone
5. A sudden increase in water pressure may break the dam
->the dam may be broken by a sudden increase in water pressure