Forming Plurals in English (with Table of Endings)

This page shows the spelling rules for forming plurals in English.

Forming Plurals

Tabulated below are the rules for forming the plurals of most nouns:

Type	Example of Type	Forming the Plural	Plural
Most Nouns	lamp scythe	add s	lamps scythes
Noun Ending s, sh, ch, x or z	dress	add es	dresses
Nouns ending [consonant] o	hero zero tomato	add either s or es (There are no rules for this - you have to know.)	heroes zeros tomatoes
Nouns ending [vowel] o	patio ratio	add s	patios ratios
Nouns ending [consonant] y	story penny	change the y to an i and add es	stories pennies
Nouns ending [vowel] y	storey () donkey	add s	storeys donkeys
Nouns ending f or fe	dwarf hoof	ves and/or s (There are no rules - you have to know.)	dwarfs hooves or hoofs
Exceptions	man louse	some nouns undergo a vowel or letters change	men lice
More exceptions	salmon sheep	some nouns do not change at all	salmon sheep

Here is an interactive test on forming plurals:

Words "stolen" from other languages form their plurals in a variety of ways.

Examples:

stadium > stadia or stadiums
(Through common usage, the plural stadiums is acceptable too.)

datum > data

radius > radii or radiuses
(Through common usage, the plural radiuses is acceptable too.)

agendum > agenda