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Rh § 168. The Passive Voice is a conversion of the Active. He is loved by me and I love him are two ways of saying the same thing.

§ 169. —The Direct Object of the Active becomes the Subject of the Passive Verb, and the Subject of the Active Verb is put into the Ablative (of the Agent) with ā or ăb. Thus: Brūtŭs Caesărem interfēcit Brutus killed Cæsar becomes Caesăr ā Brūtō interfectŭs est Cæsar was killed by Brutus.

§ 170. —These are converted by means of the Third Person Singular or Impersonal Passive: Brūtŭs ĕt Cassĭŭs Caesărī invĭdent Brutus and Cassius envy Ceasar becomes Caseaăr ā Brūtō et Cassiō Caesărī invĭdētŭr it-is-envied Cæsar (envy is felt towards Cæsar) by Brutus and Cassius. § 171. —If the Subject of a Transitive Verb is Indefinite, it is not expressed in the Passive: Thălēs săpĭ{subst:e-}}ns appellāatŭs est Thales was called a-sage; hōc crēdĭtŭr this is believed, people believe this. The Impersonal Passive of Intransitive Verbs is very frequently used where the Subject is Indefinite; ītŭr ĭn antīquam silvam people go into an ancient forest. § 172. —The Passive is often used, especially in old writers and poets, to denote an action performed by the Subject on itself; exercĕŏr I exercise myself, rĕcrĕŏr I refresh myself.

Many of these are to be translated by an English Intransitive Verb; rumpŏr I burst, pāscŏr I feed, volvŏr I roll.