ex. 1
1)-He played football when he fell over and broke his leg.
-Did he go to hospital?
-Yes, he did.
2)-When did you see Tony?
-While I waited at a bus stop yesterday morning.
3)-I called you last night but you didn't answer. Where were you?
-I exercised at the gym.
4)-What did your kids do when you came home last night?
-They watched a film on television.
ex. 2
1)mistake: when
правильно:while
2)mistake:was ringing
правильно:ringed
3)mistake:was leaving
правильно: left
4)mistake: cleaned
правильно: was cleaning