Ответ:

A. Affirmative

  1. John’s a good student.
  2. We’re ready.
  3. They’re teachers.
  4. You’re my best friend.
  5. We’re happy today.

B. Negative

  1. I’m not a dog.
  2. We aren’t ready.
  3. You aren’t five years old.
  4. They aren’t angry.
  5. I’m not a dog.