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