1: are you a schoolboy? 2: is your sister a doctor? 3: are those girl your friend? 4: are they teachers or students? 5: is your friend at home now? 6: is that page one or page two? 7: is this a text-book or an exercise-book? 8: are those doors yellow? 9: is that cup white?
No, I am not
No, she isn't
Yes,they are
They are students
Yes,he is
This is page one
This is an exercise-book
No,they aren't
Yes,it is