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