irregular future stems
Some irregular verbs also have irregular future stems. Nevertheless, the future endings are the same for all verbs: -ai , - as, -a, -ons, -ez, -ont. The future stem for the verb être is ser- and the future stem for the verb avoir is aur-.
For a list of irregular verbs which form their future in the same way as regular verbs do, see future: regular.
Here are the most common verbs that have irregular future stems:
Other -er verbs verbs with spelling changes including préférer, manger, and commençer have regular future stems.