As he was driving to work, he...
As I walked to the store, it...
Yesterday, while I was cleaning the house, I...
At 6 PM yesterday, I...
We went to the beach, and it...
I was studying for my exam when...
Last night, while we were having dinner, it...
...
Last week, she...
She finished her homework, then...
While they were playing in the park, it...
While they were watching a movie, someone...