PAST SIMPLE
1. She sang a song. – A SONG WAS SUNG BY HER.
3. Somebody hit me. – I WAS HIT BY SOMEBODY.
4. We stopped the bus. – THE BUS WAS STOPPED BY US. 
5. A thief stole my car. – MY CAR WAS STOLEN BY A THIEF. 
6. They didn't let him go. – HE WASN’T LET GO BY THEM. 
7. She didn't win the prize. – THE PRIZE WASN’T WON BY HER. 
8. They didn't make their beds. – THEIR BEDS WEREN’T MADE BY THEM. 
9. I did not tell them. – THEY WEREN’T TOLD BY ME. 
10. Did you tell them? – WERE THEY TOLD BY YOU? 
11. Did he send the letter? – WAS THE LETTER SENT BY HIM?