The document discusses the difference between active and passive voice in sentences. In active voice, the subject performs the action, while in passive voice the action is performed on the subject. It provides examples of changing sentences from active to passive voice, such as "Hamlet was written by Shakespeare" instead of "Shakespeare wrote Hamlet." The document concludes by asking the reader to change additional sentences to passive voice and find information online about inventions to change and have a classmate guess if true or false.