Passive verb forms use a form of the verb "to be" along with the past participle of the main verb. Transitive verbs that take objects can be used passively, while intransitive verbs that do not take objects cannot. Many verbs can be both transitive and intransitive depending on whether they are used with or without an object. Verbs followed by an object and preposition in the active voice have two corresponding passive forms, while verbs that cannot be used with an object have only one passive form. Certain multi-word verb forms like "talk into" can also be used passively. Passives are often used to omit the agent or subject and focus on the recipient of the action.