only questions

  1. Why are you crying?
  2. What are they laughing at?
  3. Why is he laughing?
  4. Are you listening to me?
  5. Where are your friends going?
  6. Are your parents watching TV?
  7. What’s Claire cooking?
  8. Why are you looking at me?
  9. Is the bus coming?
  10. Are you watching TV?

to be (past)

  1. I was at home alone. 
  2. I was with her here.
  3. You were at the station. 
  4. He was my friend. 
  5. She was working. 
  6. It was very late. 
  7. We were studying English. 
  8. You were my teacher.
  9. They were going home.
  10. They were at school