This document discusses the passive voice, including when and how to use it. The passive voice is used when the action is more important than the person or thing performing it, and it is more common in scientific and journalistic writing. To form the passive voice, the verb changes to some form of "to be" plus the past participle of the main verb. The tense of a passive sentence matches the tense of the corresponding active sentence. The document also provides examples of active and passive voice sentences and how to form the passive voice across several verb tenses.