Is he a pupil?
Yes, he is.
ARE THEY PUPILS?
Yes, they are.
ARE THEY VETS?
Yes, they are.
ARE THEY WAITERS?
No, they aren't.
Is she a vet?
Yes, she is.
Is he a vet?
No, he isn't.
Is she a builder?
No, she isn't.
Is he a waiter?
Yes, he is.
ARE THEY BUILDERS?
Yes, they are.
ARE THEY TEACHERS?
No, they aren't.