What is she doing?
She is playing the guitar.
What is he doing?
He is riding a bike.
What are they doing?
They are watching TV.
What is he doing?
He is riding a scooter.
What is he doing?
He is playing basketball.
What is she doing?
She is playing the piano.
What are they doing?
They are playing football.
What are they doing?
They are playing tennis.