Regular plurals
Add s
Chair/chairs
Words ending in s, ch, sh, x, z
Add -es
Dish/dishes
Words ending in a vowel + y
Add -s
Key/keys
Words ending in a consonant + y
Change the y to i and add -es
Pony/ponies
Words ending in a vowel + o
Add -s
Video/videos
Words ending in a consonant + o
Add -es
Hero/heroes
Words ending in f or fe
Change f to v and add -es
Wolf/wolves
Certain animal plurals
No change
Sheep, moose, deer, trout
Woman
Women
Child
Children
Man
Men
Person
People
Foot
Feet
Mouse
Mice
Tooth
Teeth