Грамматическая видео-сказка "To Be"

Once upon a time there was an old man. His name was To Be. He was too old to work himself, but he had three sons: Am, Is, Are. They were young and strong. They helped other words to build sentences. Am, Is and Are also had their helpers. They were a group of Pronouns that worked together with them. They were I, He and She, You and They. I liked to work with Am and they built such sentences as: “I am a doctor”, “I am a pupil”, “I am happy”. Is always worked with He or She and made sentences like: “He is a policeman”, “She is my sister”. Are also had two partners: You and They and their sentences were: “You are a good friend”, “They are very tired”. To Be was happy to have such helpers as he didn’t need to work. His sons also were happy, but only when they worked with their helpers.