what are you doing?
I'm playing a game
what is he doing?
he's riding a bike
what is she doing?
she's roller skating
Are you catching a ball?
Yes, I am
Are you singing?
No, I am not
Is he roller skating?
No, he isn't
what are you doing?
I'm singing
Is he kicking a ball?
yes, he is
Is she throwing a ball?
No, she isn't
what is he doing?
he's throwing