The document discusses the passive voice, including its form, verbs that can and cannot be used in the passive voice, and passive infinitives. The passive voice uses the form of "to be" plus the past participle of the main verb. Transitive verbs and verbs with two objects can typically be used in the passive voice. Certain verbs like intransitive verbs, stative verbs, and verbs of wanting cannot be made passive. Verbs followed by a bare infinitive in the active voice take an infinitive with "to" in the passive.