Look at these regular verbs conjugated in the Futur antérieur:
The Futur antérieur is formed on the same model as the Passé Composé, except avoir is here conjugated in the Futur.
For -ER verbs, you form the past participle by replacing the -er ending with -é.
For -IR verbs, you form the past participle by replacing the -ir ending with -i.
For -DRE verbs, you form the past participle by replacing the -dre ending with -du.
Note: the exceptions of verbs with être instead of avoir are the same as in the Passé Composé.
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Examples and resources

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aimer
atteindre
attendre
choisir
compléter
entendre
Vous aurez entendu tellement de versions différentes!You will have heard so many different versions!
finir
gagner
grossir
Vous aurez bien grossi pendant vos vacances!You will have gained quite a bit of weight during your holidays!