Irregular

Irregular

The term 'irregular' is used to describe any word that changes it's form in a way that isn't standard or like most words. 

This term is most commonly applied to verbs to distinguish those verbs that don't belong the regular groups -er, -ir, and others. However, adjectives and adverbs can be irregular too.

Irregular verbs tend to be the verbs that are most common. The four most important irregular French verbs are:
  • être (to be)
  • avoir (to have)
  • faire (to do/make)
  • aller (to go)
There are many others that can be grouped into 'semi-regular' verbs that don't fit a regular group, but still follow a pattern with some other verbs like them.
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