Insert the suitable from of the verb. doctor. we arent ? cook. nice big dog. good idea.

you.are..a doctor.
they..are.students.
we aren't singers,.are..we?
she.is...a cook.
it..is..a nice big dog.
that..is..a good idea.

You are a doctor; they arestudents; we are singers, are we?; she is a cook; it is a nice big dog; that is a good idea; i am a librarian, but my sister is nurses; these boys are pupils.