What is he doing?
He's climbing a tree.
Is she climbing a tree?
Yes, she is.
Is he running?
No, he isn't.
What is he doing?
He is throwing a rope.
What is she doing?
She is jumping.
What is he doing?
He's throwing a ball.
Is she catching a ball?
Yes, she is.
What is she doing?
She is riding a tiger.
Is he swimming?
Yes, he is.
Is she walking?
Yes, she is.
Is she riding a lion?
No, she isn't
What is he doing?
He is swimming.