1. While I was leaving the house, the postman brought me a telegram.
2. They were walking in the park when it started to rain.
3. As she was walking towards the front door, she heard some voices inside her house.
4. They were sitting in the pub when a fight started.
5. She found an old painting when she was cleaning the attic.
6. He was riding his bike very fast when he crashed into a tree.