Irregular -ER French Verbs

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There are a lot of French verbs that end in -ER and there are a lot of irregular French verbs, but there is only one irregular -ER verb. However, there are three groups of -ER verbs that have some irregularities.
 

One True Irregular -ER Verb

Aller (to go) is the only truly irregular -er verb in French - its conjugations are unique and, according to some, very odd.

Spelling Change Verbs

Spelling change verbs are verbs that end in -cer or -ger.

Their stem formation and verb endings are the same as for regular -er verbs, but there is a slight spelling change for pronunciation purposes in certain conjugations.

Stem-Changing Verbs

Stem-changing verbs are -er verbs that take the regular endings but have two different radicals. There are five categories of French stem-changing verbs: -yer, -eler, -eter, -e_er, and -é_er.

-IER Verbs

There is nothing actually irregular about the conjugation of -ier verbs - they are conjugated like regular -er verbs, but some of their forms look strange.

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Lawless, Laura K. "Irregular -ER French Verbs." ThoughtCo, Feb. 23, 2017, thoughtco.com/irregular-er-french-verbs-1368839. Lawless, Laura K. (2017, February 23). Irregular -ER French Verbs. Retrieved from https://www.thoughtco.com/irregular-er-french-verbs-1368839 Lawless, Laura K. "Irregular -ER French Verbs." ThoughtCo. https://www.thoughtco.com/irregular-er-french-verbs-1368839 (accessed December 15, 2017).