Are they jumping?
No, they aren't
Are they eating?
No, they aren't
What are they doing?
They're running
Are they running?
Yes, they are
What are ................? They're jumping
they doing
Are they sleeping?
Yes, they are.
What ................................. ? They're swimming.
are they doing
Are they reading?
No, they aren't
What are they doing?
They're playing.