Was she dancing last night?
Yes, she was.
Was he hungry last night?
Yes, he was.
Were they swimming last month?
No, they were not.
Was it playing basketball last week?
No, it was not.
Was he at the beach yesterday?
Yes, he was.
Was he cooking yesterday?
Yes, he was.
Were they jumping yesterday?
Yes, they were.
Was he listening to music last night?
No, he was not.
Were they at a party last week?
Yes, they were.
Were they sleeping yesterday?
No, they were not.