The plural form of words is usually formed by adding “S”.
However, there are some irregular plural forms.

How to form the plural:

Try to practise irregular plural nouns with this test:

Irregular Plural Nouns Test

Ending	Plural	Example
S, X, CH, SH, Z	Add - ES	Boss – bosses Tax – taxes Church – churches
Consonant + Y	Change Y to I and add ES	Fly – flies Party - parties
FE	Change F to V and add S	Knife – knives Life – lives Wife – wives
F	Change F to V and add ES	Half – halves Wolf – wolves Loaf – loaves
O	O Add ES	Potato – potatoes Tomato – tomatoes Volcano – volcanoes

Single	Plural
Man	Men
Woman	Women
Person	People
Child	Children
Foot	Feet
Tooth	Teeth
Die	Dice
Mouse	Mice
Goose	Geese
Fish	Fish
Sheep	Sheep
Deer	Deer
Moose	Moose

Irregular Plural Nouns