Поставьте глагол to be в нужную форму
She ... is a doctor
Your room .... large.
Peter and Gorge ... tall
I ... at school now

Глагол to be: 1) is 2) am 3) are, Таким образом: 1) не изменяем,т.к. she IS a doctor. 2) Your room IS lardge. 3)Peter and Gorge ARE tall 4) I am at school now.