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Future perfect indicative

Formation

The future perfect is a compound tense formed with the future of the auxiliary (avoiror être, see Auxiliaries) and the past participle:

Elle aura fini avant huit heures. (She will have finished before eight o'clock.)
Demain matin, ils seront tous partis. (Tomorrow morning they will all have left.)

(See Past participle agreement for rules on agreement.)


Use

The future perfect is generally used to distinguish one future event that precedes another. It is frequently used with such conjunctions as quand, lorsque, dès que, and aussitôt que:

Ils auront déjà fini de manger quand nous arriverons. (They will already have finished eating by the time we get there.)
J'enverrai la lettre aussitôt que je l'aurai écrite. (I'll send the letter just as soon as I have written it.)


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