What is he doing?
He is flying a plane.
What are they doing?
They are swimming.
What is she doing?
She is driving a lorry.
What is are they doing?
They are eating a fish.
What is he doing?
He is reading a book.
What are they doing?
They are playing tennis.
What are they doing?
They are watching TV.
What is she doing?
She is playing the guitar.