Design a language learning task

Refer to the sample activities in your textbook and design a language learning task from behaviorist views for teaching one of the followings (just one):
  1. The passive voice
  2. Tenses: past tense, present perfect etc.
  3. Accepting/refusing an invitation
I will mark randomly 10 students. So, make sure you do this exercise. You have 1 week for this homework.