1. When I was walking in the park (a past action that was happening), I saw a rainbow (another action interrupted).
2. When she was studying for her exam (a past action that was happening), she heard a loud noise (another action interrupted).
3. When they were cooking dinner (a past action that was happening), the power went out (another action interrupted).
4. When he was driving home (a past action that was happening), a deer ran across the road (another action interrupted).
5. When we were playing soccer (a past action that was happening), it started to rain (another action interrupted).
6. When she was painting (a past action that was happening), she accidentally spilled some paint (another action interrupted).
7. When he was reading (a past action that was happening), he saw a spider crawling on the page (another action interrupted).
8. When they were watching TV (a past action that was happening), the show suddenly ended (another action interrupted).