1. Ron was sleeping, when he heard a loud noise.
2. What were you doing, when I phoned you?
3. Jenny wasn't doing her homework, when Nick arrived.
4. Maria and Paul were playing chess, when their parents came home.
5. Sam and Kevin were visiting Barcelona's stadium, when they saw Messi.
6. While I was cooking dinner for my parents, my friend phoned me.
7. While I was looking out of the window, my cat stole my food from the plate.
8. Where were the athletes running, when you saw them?