Common regular -er verbs. This is an extremely important irregular verb to learn in French as it’s used very often. Its conjugations are completely unique and in French it’s categorized in le troisième groupe. The verb with the infinitive ending removed is called the stem or radical. The vast majority of verbs that end in -er follow this pattern; the only exceptions are aller and stem-changing verbs. ** These verbs have one small irregularity in the spelling of certain conjugations – learn more. To conjugate -ER verbs, remove the infinitive ending to find the stem and add the endings. But there are three patterns in the conjugation of so-called regular -er verbs that set them apart from the rest. Aller Verb conjugation table for the French verb aller, meaning “to go”. The verb aller is one of a few common but highly irregular French verbs: As shown in the verb tables on this page, the verb aller has various irregular forms in the present tense, and is one of the few verbs with a third person plural present tense form ending in -ont. Technically, there is only one irregular -er verb: aller (to go). The French irregular verb aller ("to go") is one of the most frequently used of all French verbs. * French grammarians consider that there are three types of verbs. The verb form that ends in -ER is called the infinitive, and -ER is the infinitive ending.