1. An act is being performed by the elephants.
  2. The letter was typed by my boss.
  3. North America was settled by the British.
  4. The cure for the sickness was found by her.
  5. The bone was found by the dog.
  6. The letter will be signed by him today.
  7. A message is being sent to him.
  8. Spanish is spoken at that store.
  9. The sidewalk is being repaired by the city.
10. The thief is being sentenced by the judge.
11. The students were confused by her explanation.
12. He was stopped by the police on the freeway.
13. The office is opened in the morning.
14. That letter was written by her last night.