Is he drawing a picture?
No, he isn't.
Is she cleaning her house?
No, she isn't. She's dancing.
Are you playing with the dog?
No, I'm not. I'm not playing with the dog.
Is he reading a book?
Yes, he is.
Is she doing her homework?
No, she isn't.
Is he watching TV?
Yes, he is. He's watching TV.
Is she walking?
No, she isn't. She isn't walking.
Is he eating a cake?
No, he isn't. He isn't eating a cake.
Is she riding a bike?
Yes, she is.
Is he playing on the beach?
No, he isn't.