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2. I was playing golf with my dad when it started raining.

3. While Gran was singing her false teeth fell out.

4. While Rob was playing guitar one of the guitar strings broke.

5. Mum and dad were still arguing when I left the house.

6. They were listening to the news when they heard the news.

7. I lost my wallet while I was shopping.

8. He was having a shower when the postman knocked on the door.

P.S. Hope it helps. If you have any questiolns, feel free to ask them in the comment section below. I'll be happy to help. Have a wonderful day!