Is she dancing?
Yes, she is.
Is he painting?
Yes, he is.
Is he skating?
Yes, he is.
Is she catching the ball?
No, she isn't.
Are they playing soccer?
Yes, they are.
Is she hitting a ball?
No, she isn't.
Are they playing tennis?
No, they aren't.
Are they playing video games?
Yes, they are.
Is he hitting a ball?
Yes, he is.
Is he playing piano?
Yes, he is.