This document discusses active and passive voice in English grammar. It defines active voice as when the subject performs the action of the sentence and passive voice as when the subject receives the action. It provides examples of sentences in both active and passive voice. It also discusses the different forms of passive voice according to tense (present, past, perfect, future) and their common uses in different text types like descriptions and narratives. It cautions that some sentences should not be changed to passive voice if it sounds unnatural. Overall, the document provides an overview of active and passive voice in English and how to identify and properly use the different forms of passive voice.