It is formed by adding to the infinitive endings: -ai, -as, -a, -ons, -ez, -ont. Only some verbs (enumerated below) have irregular forms. If the infinitive ends in -re, the -e is removed : mettre - mettrai, battre - battrai.
1st group (verbs in -er like parler):
| singulier | pluriel | |
| 1 | parlerai | parlerons |
| 2 | parleras | parlerez |
| 3 | parlera | parleront |
2nd group (finir):
| singulier | pluriel | |
| 1 | finirai | finirons |
| 2 | finiras | finirez |
| 3 | finira | finiront |
3rd group (ouvrir):
| singulier | pluriel | |
| 1 | ouvrirai | ouvrirons |
| 2 | ouvriras | ouvrirez |
| 3 | ouvrira | ouvriront |
Some verbs of the 3rd conjugation have irregular futur simple:
| être | serai |
| avoir | aurai |
| aller | irai |
| acquérir | acquerrai |
| envoyer | enverrai |
| faire | ferai |
| mouvoir | mouvrai |
| pleuvoir | il pleuvra |
| recevoir | recevrai |
| savoir | saurai |
| tenir | tiendrai |
| valoir | vaudrai |
| venir | viendrai |
| voir | verrai |
| vouloir | voudrai |