What are you doing?
I'm playing tennis.
What are you doing?
I'm watching TV.
What are you doing?
I'm playing basketball.
What are you doing?
I'm playing football.
What are you doing?
I'm swimming.
What are you doing?
I'm playing badminton
What are you doing?
I'm playing the guitar.
What are you doing?
I'm riding a bike.
What are you doing?
I'm riding a skateboard.
What are you doing?
I'm playing the piano.