This document discusses the differences between active and passive voice. It explains that active voice is used to express what the subject does, while passive voice expresses what happens to the subject. The passive is formed using be + the past participle of the main verb. When forming the passive, the subject of the active sentence becomes omitted if it is indefinite (they, someone, people). The agent (person or thing performing the action) is also usually omitted, especially when it is understood from context.
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