This document discusses the difference between active and passive voice in English grammar. It defines active voice as having the subject perform the action of the verb, while passive voice has the subject receive the action. The document provides examples of sentences in both voices and notes that active voice is generally clearer and easier to understand. It also discusses when to use passive voice, such as when the recipient of the action is more important than the subject. The document concludes by recapping the key differences between active and passive voice and listing the eight tenses that can be converted to the passive form.