Is he a singer?
Yes, he is
Is she a singer?
Yes, she is
Is he a cook?
Yes, he is
Is she a ballerina?
No, she isn't
Is he a waitress?
No, he isn't
Is he a doctor?
No, he isn't
Is she a doctor?
Yes, she is
Is he a doctor?
Yes, he is
Is she a waitress?
Yes, she is