Future Tense

French future conjugations are, along with the conditional, the easiest in the entire language. Regular verbs and the majority of irregular verbs use their infinitives as the future stem, and there is a single set of future endings for all verbs.

  • For -er and -ir verbs, add the future ending to the infinitive.
  • For -re verbs, remove the final -e from the infinitive before adding the future endings.
  • For stem-changing and the few irregular future verbs, add the future ending to the irregular future stem.

Par exemple…
Here are the future conjugations for the regular verbs aimer (to like), choisir (to choose), and rendre (to return); the stem-changing verb lever (to lift), and the irregular verb être (to be):

Pronoun Ending aimer >aimer choisir >choisir rendre >rendr lever >lèver être >ser
je / j’ -ai aimerai choisirai rendrai lèverai serai
tu -as aimeras choisiras rendras lèveras seras
il -a aimera choisira rendra lèvera sera
nous -ons aimerons choisirons rendrons lèverons serons
vous -ez aimerez choisirez rendrez lèverez serez
ils -ont aimeront choisiront rendront lèveront seront

From www.lawlessfrench.com