I was drinking when he opened the door.
They were taking a walk when she fell down.
We were finishing the discussion when Marie arrived.
I used to love him.
We used to go to that store.
We used to speak to them from time to time.
It was cold but it was sunny.
We wanted to leave but we couldn't.
She couldn't come.
She was waiting for us in front of the movie theatre.
They were taking a walk.
What were they doing?
I was answering the question.
It was snowing when she arrived.