1. While I __________ (walk) to school, I __________ (see) an accident.
2. She __________ (drop) her phone while she __________ (run) for the bus.
3. The students __________ (work) quietly when the teacher __________ (leave) the classroom.
4. He __________ (hurt) his leg while he __________ (play) football.
5. When the lights __________ (go) out, we __________ (watch) a film.
6. My mum __________ (cook) dinner when someone __________ (knock) on the door.
7. They __________ (find) some money while they __________ (walk) through the park.
8. While Sarah __________ (talk) to her friend, the teacher __________ (ask) her a question.