4. Second exception. Those ending in au and eu take x, as:

corbeau, corbeaux, crow, crows.
jeu, jeux, play, plays.

5. Third exception. The six following, ending in ou, take x, as:

bijou, bijoux, jewel, jewels.
caillou, cailloux, pebble, pebbles.
chou, choux, cabbage, cabbages.
genou, genoux, knee, knees.
hibou, hiboux, owl, owls.
joujou, joujoux, toy, toys.

6. Fourth exception. The seven following, ending in ail, change this into aux, as:

bail, baux, lease, leases.
corail, coraux, coral, corals.
émail, émaux, enamel, enamels.
soupirail, soupiraux, air-hole, air-holes.
travail, travaux, work, works.
sous-bail, sous-baux, under-lease, under-leases.

N. B.--Peculiar are bétail, cattle, which makes bestiaux, and ail, garlic, which makes aulx.

7. Fifth exception. Those ending in al change this into aux, as:

animal, animaux, animal, animals.
mal, maux, evil, evils.
cheval, chevaux, horse, horses.
général, généraux, general, generals.