Past+Simpl
He read this book 2 years ago.
How did you spend your holidays?
The students took part in the play, didn't they?
I was in the theater yesterday and I didn't see my sister there.
Did you tell you friends about the project?
Past+Progressive
You were watching TV when the phone rang.
She was listening to the radio at 10 p.m. yesterday.
While we were cooking dinner, it started to rain.
I was sleeping, so I didn't hear you knocking on my door.
Sam was waiting for us when we got off the plane.