Ответ:

  1. He is a student.
  2. You are ready.
  3. The boy is my friend.
  4. Where is she? — She is in the park.
  5. How old are you? — I am ten. (Ответ должен соответствовать вопросу о возрасте.)
  6. I am not at school.
  7. They are not friends.
  8. You are cold, aren’t you?
  9. They are hungry, aren’t they?