Is he riding a bike?
Yes, he is.
Is he riding a bike?
No, he isn't.
Is she playing with a kitten?
Yes, she is.
Is he flying a kite ?
Yes, he is.
Is she flying a kite?
No, she isn't.
Is she playing with a kitten?
No, she isn't.
Is he eating a cake?
Yes, he is.
Is he reading a book?
Yes, he is.
Is she flying a kite?
Yes, she is.
Is she skating?
Yes, she is.