Is he riding a bike?
Yes, he is.
Is he riding a bike?
No, he isn't.
Is she walking?
No, she isn't.
Are they walking?
Yes, they are.
Is she crying?
Yes, she is.
Is she dancing?
Yes, she is.
Are you swimming?
Yes, I am.
Is she crying?
No, she isn't.
Are you swimming?
No, I'm not.
Is he flying?
No, he isn't.
Are they going to school?
No, they aren't.
Is he shouting?
Yes, he is.