What colour is it?
It's white.
It / school
It's a school.
He / teacher
He's a teacher.
It / lesson
It's a lesson.
She / teacher
She's a teacher.
What colour is it?
It's blue.
What colour is it?
It's orange.
It / classroom
It's a classroom.
This / my homework
This is my homework.
He / student
He's a student.