1. "I was watching TV when you called."
  2. "She was studying all night for her exam."
  3. "They were playing football in the rain."
  4. "He was working on his project until midnight."
  5. "We were planning our trip to Italy last June."
  6. "The birds were singing early in the morning."
  7. "I was cooking dinner when the power went out."
  8. "She was reading a book by the fireplace."
  9. "They were discussing their plans for the weekend."
  10. "He was jogging in the park when he saw the accident."
  11. "We were listening to music while doing our homework."
  12. "The teacher was explaining the lesson when the bell rang."
  13. "I was waiting for the bus when it started to rain."
  14. "She was painting a landscape in her studio."
  15. "They were celebrating their anniversary at a restaurant."
  16. "He was fixing his bike in the garage."
  17. "We were watching the stars from our backyard."
  18. "The cat was sleeping on the windowsill."
  19. "I was trying to call you but your phone was off."
  20. "She was taking a bath when the phone rang."