What was she doing?
She was working in an office/using the computer.
What was she doing?
She was buying food in the supermarket.
What was he doing?
He was painting a picture.
What were the students doing?
They were learning/studying/sitting in a classroom.
What were they doing?
They were taking a photo/ a selfie.
What was she doing?
She was playing tennis.
What were they doing?
They were cleaning the house.
What were they doing?
They were dancing.
What was he doing?
He was running a race.
What was he doing?
He was reading a book.
What were they doing?
They were walking the dog.
What were they doing?
They were watching TV.
What was she doing?
She was cooking.
What was he doing?
He was jumping out of a plane.
What was he doing?
He was eating dinner in a restaurant.
What was he doing?
He was fishing.