When you called I was taking a shower.
I was playing when she called.
Charlie and me were already driving home when the engine suddenly stopped.
We were not playing chess when you called.
I was sleeping when someone knocked at the door.
Sally was reading a book when the doorbell rang
It wasn’t raining when tha basketball match started
Were you writing a letter when James came into the room?
Was a kitten drinking milk when a big dog came to it?