This document discusses the use of passive sentences. It explains that passive sentences can be used to describe situations, states or locations by using the subject, form of "be", past participle, and a prepositional phrase. It also explains that passive sentences can be used to report opinions or ideas using either the structure of "it be + past participle (by agent) that clause" or "be + past participle (by agent) to phrase". Examples are provided to illustrate these uses of passive sentences.