To be afirmativ trecut:
Yesterday it was sunny outside.
She was happy with your response.
They were glad to see us.
We were looking forward to the event that got cancelled.
To be la negativ trecut: (in paranteza e forma prescurtata)
They were not (weren't) in the mood to hang out.
My dog was not (wasn't) happy when his toy got lost.
The homework was not (wasn't) too difficult.
The parking lot was not (wasn't) as empty as I wanted it to be.