Laura K. Lawless's Blog: Lawless Languages, page 391

Irregular -er Verbs

Technically, there is only one irregular -er verb, aller. But there are three patterns in the conjugation of so-called regular -er verbs that set them apart from the rest.

                

C’est

C'est, literally "this is," is the required contraction of ce + est. It's one of the most important French expressions with a few possible meanings, including that is, it is, and he is.

                

Chéri

Read the opening dialog of the 1920 romance novel Chéri, by Colette.

                

Variable Negative Pronouns

Variable negative pronouns are used in place of a negative adjective + noun, and must agree with the noun in gender.