Are you studying English?
No, I'm not
What is he doing?
He's playing the guitar
Is he playing chess?
No, he isn't
it/ Is/ running/ ?
Is it running?
What is she doing?
She is drinking water
What are they doing?
They're playing the piano
he/ eating/ pizza/ is
He is eating pizza
she/ playing/ chess/ Is/?
Is she playing chess?
Are/ playing/ basketball/ they/ ?
Are they playing basketball?