1. We were having dinner while they were listening to the radio.
2. The fire started when she was sleeping
3. What were you doing when it began to rain?
4. When the farmer started whistling, he was ploughing the field
5. What were they doing when you came?
6. What was happening when she came?
7. The man came in while she was reading a book.
8. The volcano erupted while they were working in the field
9. The lava hit the town when the ship was leaving the harbor
10. Someone hit the headmaster on the head when he was going to his car
