1. Linda was sleeping well when her friend came her to see her.
2. Ann was laying the table when she broke a plate.
3. The students were talking busily when we came up to them.
4. The girls were talking busily, when we came up to them.
5. I was having breakfast when mum called me,
6. She was walking her dog at 10 a.m.
7. Kate was trying to open the door when we saw her.
PS: Past Continuous
was/were + Ving (v-verb)