27. When I met Mary and Tom, they were going to school.
28. We were painting a picture while Alice was making a birthday cake.
29. Were they cooking when I called you yesterday?
30. When I went to the concert, my sister was performing.
31. While we were going swimming, Zoe was reading a comic.
32. While I was sleeping, Daisy was trying to contact me.
33. When Mary came back home, everyone was sleeping.
34. While I was doing my homework, he was playing video games.
35. While Sarah was cutting the grass in the garden, the snake appeared.
36. When my friends came, my parents were having dinner.
37. The earthquake happened while we were sleeping.
38. He was writing the textbook when he had a headache.
39. She was typing the book while I was learning Chinese.
40. While he was driving, the police ordered him to stop his car.
41. It was raining heavily while they were playing football.
42. They were looking at the pictures when I broke the glass.
43. When I arrived at his house, he was still sleeping.
44. The light went out while we were having dinner.
45. Bill was having breakfast when I stopped at this house this morning.
46. When I came to his house, he was working.
47. As we were crossing the street, we saw an accident.
48. Tom saw a serious accident while he was standing at the bus stop.
49. The children were playing football when their mother came back home.
50. The bell rang while Tom was taking a bath.