Yes, my mum was cooking pizza yesterday.
Was your mum cooking pizza yesterday?
She was studying for the quiz on Monday.
What was she doing on Monday?
Answer the question: was the cat drinking water? (Negative).
No, it wasn't or No, I was not.
Create the question for the answer: I was reading a book yesterday.
What were you doing yesterday?
Sam and Andrew were studying this morning.
What were Sam and Andrew doing this morning?
Answer the question: were you travelling yesterday? (Negative).
No, I wasn't. or No, I was not.
He was dancing last weekend.
What was he doing last weekend?
Yes, we were eating hamburgers.
Were you eating hamburgers?