Are you sleeping?
No, I'm not.
you + taking a picture
Are you taking a picture?
What + you
What are you doing?
What + you + doing
What are you doing?
What are they doing?
They are riding a bike
What + I
What am I doing?
they + watching a parade
Are they watching a parade?
What + we + doing
What are we doing?
you + riding a scooter
Are you riding a scooter?