Ответ:

1. I was having a shower when the postman arrived.
2. Sandra dropped her bag while she was running for the bus.
3. He was reading the letter when he suddenly started to laugh.
4. The sun was shining, so we decided to have a barbecue.
5. She hurt her finger while she was cutting some bread.
6. Pat was living in Greece when he met Hannah.

I was having a shower when the postman arrived.

Sandra dropped her bag while she was running for the bus.

He was reading the letter when he suddenly started to laugh.

The sun was shining, so we decided to have a barbecue.

She hurt her finger while she was cutting some bread.

Pat was living in Greece when he met Hannah.