1. The doorbell was ringing while I was sleeping.
2. We saw an accident while we were driving a car.
3. Tina fell asleep while she was learning English.
4. She was sunbathing while we were playing golf.
5. Sam was not looking at the camera when the photograph was taken of him.
6. Ben was not listening to me when I was talking to him.
7. The kids were eating a chocolate cake when Mom came home.
8. The students were walking in the park while the teacher was checking their tests.
9. Kate was reading a book when the light went down.
10. We were watching a film when our friends called.