2. While we were doing a maths test, the head teacher came into the room.
3. While we were swimming, it started to rain.
4. While I was having a bath, the lights went out.
5. Debra was watching TV when the storm began.
6. While I was walking to the shop I lost my bag.
7. What were you doing when I saw you yesterday?
8. I was walking up the stairs when I heard the phone.