Make active sentences to passive simple past: 1)she sang a song. 2)we stopped the bus. 3) a thief stole my car. 4)they didn't let him go. 5) she didn't win the prize. 6) i did not tell them. 7)did he send the letter?

1. A song was sung.
2. The bus was stopped.
3. My car was stolen by a thief.
4. He was not allowed to go.
5. The prize wasn't won.
6. They were not told.
7. Was the letter sent?