Are they swimming?
Yes, they are.
Is she kicking a ball?
Yes, she is.
What is he doing?
He is skating.
Is she dancing?
No, she isn't
What is she doing?
She is skipping.
Is she dancing?
Yes, she is
Is he riding a bike?
Yes, he is.
What are they doing?
They are singing.
Is he hitting a ball?
Yes, she is.
Is he throwing a ball?
No, he isn't.
Are they catching a ball?
Yes, they are.
What is he doing?
He is singing.