French Future Perfect
Le futur antérieur is the future perfect tense of the indicative mood. It's used to express actions that will happen before other actions in the future: it could be called 'the past of the future'.
In English, the future perfect is formed with ''will have'' + past participle of the verb, in French le futur antérieur is formed with avoir or être in le futur + past participle.
For example
See also: French Futur and All French tenses