19. French Formation of Plural Nouns

Sing.Plural

To make a noun plural, you usually add an -s. But there are some exceptions:
If a noun already ends in an -s, add nothing.	bus	le bus	les bus
If a noun ends in -eu or -eau, add an x.	boat	le bateau	les bateaux
If a masculine noun ends in -al or -ail, change it to -aux.	horse	le cheval	les chevaux
Some nouns ending in -ou add an -x instead of -s.	knee	le genou	les genoux

There are, of course, some weird exceptions:
un œil (eye)
des yeux (eyes)
le ciel (sky)
les cieux (skies)
un jeune homme (a young man)
des jeunes gens (young men)

some weird exceptions

» 4. French Nouns, Articles and Demonstrative Adjectives
» Noncount nouns
» Nouns: Gender and agreement
» Nouns: Gender and agreement 2
» Nouns: Gender and agreement 3