Are they teachers?
No, they aren't. They're students.
Is he a cook?
Yes, he is.
Is he a vet?
No, he isn't. He's a gardener.
Is she a firefighter?
No, she isn't. She's a teacher.
Is he a teacher?
Yes, he is.
Are they students?
Yes, they are.
Is he a doctor?
Yes, he is.
Is he a police officer?
Yes, he is.
Is she a police officer?
No, she isn't. She's a doctor.
Is she a vet?
Yes, she is.