Is he a police officer?
Yes, he is.
Is she a dentist?
Yes, she is.
Is she a gardener?
No, she isn't.
Is he a teacher?
Yes, he is.
Is she a teacher?
No, she isn't.
Is she a vet?
Yes, she is.
Is he a firefighter?
Yes, he is.
Is he a doctor?
No, he isn't.