Singular = one
Plural = more than one
Plural nouns in English follow several consistent patterns.
1) Basic Rule: Add –s
The most common way to form plurals is to add -s to the noun.
Examples:
- - cat → cats
- - book → books
- - car → cars
- - dog → dogs
- - apple → apples
- - banana → bananas
- - orange → oranges
- - animal → animals
- - pencil → pencils
- - plate → plates
- - bird → birds
- - present → presents
2) Add –es for Nouns Ending in s, x, z, ch, sh
Use -es for words ending in s, x, z, ch, sh.
Examples:
- - bus → buses
- - box → boxes
- - quiz → quizzes (double the “z”)
- - church → churches
- - dish → dishes
- - fox → foxes
- - match → matches
- - lunch → lunches
- - peach → peaches
- - watch → watches
- - wish → wishes
- - brush → brushes
3) Irregular Plurals
Some plural forms are irregular and do not follow a clear pattern.
Examples:
- - man → men
- - woman → women
- - child → children
- - person → people
- - foot → feet
- - tooth → teeth
- - goose → geese
- - mouse → mice
- - ox → oxen
- - crisis → crises
- - thesis → theses
- - criterion → criteria
- - phenomenon → phenomena
- - stimulus → stimuli
- - cactus → cacti
- - focus → foci
- - nucleus → nuclei
- - fungus → fungi
- - syllabus → syllabi
- - alumnus → alumni
- - octopus → octopi
- - louse → lice
- - datum → data
- - curriculum → curricula
- - appendix → appendices
4) Change –f or –fe to –ves
For nouns ending in -f or -fe, change to -ves.
Examples:
- - knife → knives
- - leaf → leaves
- - life → lives
- - loaf → loaves
- - thief → thieves
- - scarf → scarves
- - shelf → shelves
- - wife → wives
- - calf → calves
- - elf → elves
- - half → halves
- - self → selves
Exceptions: Some nouns ending in -f simply add -s.
- - chief → chiefs
- - roof → roofs
- - belief → beliefs
- - chef → chefs
- - cliff → cliffs
5) Nouns Ending in -o
Consonant + o → add -es
- - tomato → tomatoes
- - potato → potatoes
- - hero → heroes
- - echo → echoes
- - torpedo → torpedoes
- - tornado → tornadoes
- - domino → dominoes
- - mango → mangoes / mangos
- - cargo → cargoes / cargos
- - mosquito → mosquitoes / mosquitos
- - volcano → volcanoes / volcanos
- - buffalo → buffaloes / buffalos
Adding -es is more common, but -s is also acceptable.
Vowel + o → add -s
- - zoo → zoos
- - radio → radios
- - studio → studios
- - video → videos
- - kangaroo → kangaroos
- - portfolio → portfolios
- - bamboo → bamboos
Exceptions (Consonant + o → add -s)
- - piano → pianos
- - photo → photos
- - memo → memos
- - casino → casinos
- - piccolo → piccolos
Either -s or -es (both correct, -s more common):
- - zero → zeros / zeroes
- - avocado → avocados / avocadoes
6) Nouns Ending in –y
Consonant + y → change y to -ies
- - baby → babies
- - city → cities
- - story → stories
- - country → countries
- - spy → spies
- - army → armies
- - puppy → puppies
- - butterfly → butterflies
- - cherry → cherries
Vowel + y → add -s
- - toy → toys
- - key → keys
- - boy → boys
- - day → days
- - birthday → birthdays
- - monkey → monkeys
- - guy → guys
7) Unchanging Plural Nouns (Invariable Nouns)
Some nouns have the same form in singular and plural.
Examples:
- - aircraft → aircraft
- - sheep → sheep
- - deer → deer
- - salmon → salmon
- - tuna → tuna
- - fish → fish (but “fishes” for species)
- - species → species
- - series → series
- - trout → trout
- - moose → moose
- - bison → bison
- - swine → swine
- - cod → cod
- - reindeer → reindeer
- - offspring → offspring
- - headquarters → headquarters
8) Plural-Only Nouns
Some nouns exist only in the plural form, even when referring to a single item.
Examples:
- - trousers
- - jeans
- - shorts
- - scissors
- - glasses
