The futur antérieur describes something that happens in future before another future event.
Example
I will have had tea before 5 o'clock.
J'aurai pris le thé avant 17 heures.
Futur antérieur is a compound tense. Like all compound sentences it is formed with the help of an auxiliary verb and the past participle of the verb. Auxiliary verb will be in future.
What is the formation of the sentence?
Subject Auxiliary verb Past participle
1. J' aurai pris
I will have taken
2. Elle sera partie
She will have left
* Rule of agreement in gender number is same as in passé composé.
When the verb être is used as an auxiliary verb , past participle agrees with gender and number with the subject and no agreement rule is for avoir.
Does the rule about quand, lorsque, dès que, une fois que apply in futur antérieur?
Yes, if the action occurred before another future action, then the first event will be in the future perfect or futur antérieur and the second event will be in futur simple.
Example
1. Dès que je aurai vu le professeur, je dirai bonjour.
2. Une fois que je aurai écrit la lettre, je l'enverrai à mon ami.
3. Une fois qu'elle aura acheté des pommes, elle préparera le déjeuner pour sa famille.
4. Une fois que tu auras étudi le poème, tu le réciteras.
5. Je te téléphonerai après que mes parents seront partis.
Pendant que and tendis que are used with future simple not with futur antérieur.
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