nAdd s to most words
(computers, cats)
nAdd es to words ending in s, ch, sh and x (tosses, catches,
mashes, boxes)
nAdd s to words ending in y after
a vowel or in proper names (trays, Kennedys)
nAdd ies to words ending in y after
a consonant (companies, pennies)
nAdd s to words ending in o
after a vowel (videos, radios)
nAdd es to words ending in o
after a consonant (heroes, zeroes)