The "Future Antérieur" is a French verb tense used to express an action that will have been completed before another future action occurs. It is formed using the future tense of the auxiliary verbs avoir or être followed by the past participle of the main verb. For example, "J'aurai fini" means "I will have finished." This tense is often used in sentences that describe a sequence of events in the future. For instance, "Quand tu arriveras, j'aurai déjà mangé" translates to "When you arrive, I will have already eaten." The "Future Antérieur" helps clarify the timing of actions in future contexts.