The simple future indicative or future de l'indicatif in french, is a simple tense. This tense is not formed with an auxiliary.
The simple future indicative endings correspond to the present indicative of the verb avoir. They are always regular: -ai, -as, -a, -ons, -ez, -ont pronounced /e, a, a, ɔ̃, e, ɔ̃/.
Between the future stem and these endings the infinitive ending is inserted, though the pronunciation of the -er infinitive changes from /e/ to /(ə)ʀ/. In other words, to form the future tense these endings are appended to the infinitive: Je finirai, tu parleras, elle sortira, nous travaillerons, vous rougirez, ils partiront.
But there are several irregular future stems, especially in the third group.
Example: je descendrai, the ending e of the infinitive descendre is removed for the verbs of the third groups ending with re.
The following verbs have a double r in future forms: envoyer, renvoyer (j'enverrai, je renverrai), mourir (je mourrai), courir (je courrai), choir, échoir (il cherra, il écherra), acquérir, conquérir (j'acquerrai, je conquerrai), voir (je verrai), pouvoir (je pourrai).
Simple future indicative endings
The simple future indicative endings correspond to the present indicative of the verb avoir. They are always regular: -ai, -as, -a, -ons, -ez, -ont pronounced /e, a, a, ɔ̃, e, ɔ̃/.
Here are the complete endings in simple future indicative for the three groups :