A singular noun refers to just one person, animal, thing or place.
E.g.: Boy, school, apple

A plural noun represents more than one person, animal, thing or place.
E.g.Boys, schools,  apples

Ways of forming plurals
 Rule #1: "S"
The plural of a noun is usually formed by adding ‘s’ to the singular.
Examples
Singular
Plural
Girl
Girls
Eye
Eyes
Table
Tables
Cat
Cats
House
Houses
bottle
bottles
desk
desks
window
windows
Sticker
stickers

Rule #2: "-ES"
By adding ‘es’ to the singular. Noun ending in ch, sh, o, x and z form their plural in this way.

watch
watches
Church
Churches
Dish
Dishes
Pass
Passes
Hero
Heroes
Fox
Foxes
Waltz
Waltzes
Exceptions:
Piano
Pianos
Dynamo
dynamos
Bamboo
bamboos
memento
mementos
eskimo
eskimos
photo
photos

Rule #3:  Words that end with a CONSONANT + "Y"
 If a noun ends in ‘y’, preceded by a consonant, then it forms the plural by changing the ‘y’ to ‘I’ forms the plural by changing the ‘y’ to ‘I’ and adding ‘es’.
summary
summaries
lady
ladies
fly
flies
company
companies
family
families
story
stories

Rule #4:  Words that end with a VOWEL + "Y"

If a vowel comes immediately before the final ‘y’ an ‘s’ is added and the ‘y’ is unchanged.
kidney
kidneys
day
days
toy
toys
monkey
monkeys
guy
guys
journey
journeys

Rule #5: Words that end with "O" - The tricky rule
Some words add "-es" while some add "-s". Most nouns ending in "O" preceded by a consonant is formed into a plural by adding "-es".
Singular Noun
Plural Noun
CONSONANT + O
-ES
motto
mottoes
potato
potatoes
hero
heroes
volcano
volcanoes

Most nouns ending in "O", preceded by a vowel, is formed into a plural by adding "-s"
Singular Noun
Plural Noun
VOWEL + O
-ES
folio
folios
cameo
cameos
studio
studios
portfolio
portfolios

Rule #6 : Nouns ending in "-F" or "-FE" - also tricky!
The plural of a noun ending in ,f, or ‘fe’ is formed by dropping ‘f’ or ‘fe’ and adding ‘ves’
life
lives
thief
thieves
shelf
shelves
wife
wives
leaf
leaves
wolf
wolves
Exceptions:
chief
chiefs
proof
proofs
dwarf
dwarfs
gulf
gulfs
Irregular plurals
man
men
woman
women
mouse
mice
tooth
teeth
child
children
goose
geese
foot
feet
louse
lice
ox
oxen
 Some nouns are same in the singular  and plural form:

Deer, Sheep, Scenery, Stationery, Swine, Score, Information, News,Staff, Paint, medicine, Soap, Athletics, economics, gymnastics, linguistics, mathematics, mechanics,   measles, mumps, physics, politics and pyrotechnics ,Aircraft , Corps, etc

 Some nouns are always singular:

Gold, Silver, Wheat, Corn, Sugar
Some nouns are always used in the plural form:

Scissors, Shears, Bellows, Trousers, Measles, People, Poultry, Cattle, caroms, Billiards, Means, police, Jeans, Shorts,Spectacles
 A pair of" can be used with the above plural nouns and take a singular verb.
·  This pair of purple trousers does not match your yellow jacket.
·  These knives do not cut well. A new pair of stainless steel scissors is what I need.
Here are some plural forms of words borrowed from Greek, Latin and other languages.
Bandit
Banditti
Radius
Radii
Formula
Formulas/formulae
Axis
Axes
Oasis
Oases
Crisis
Crises
Terminus
Termini
Vertebra
Vertebrae/vertebras
Fungus
fungi
Medium
Media
Datum
Data
Agendum
agenda
Alumnus
alumni
Analysis
analyses
Bacterium
bacteria
Basis
bases
Appendix
appendices/  Appendixes
Synopsis
synopses
Thesis
theses
Phenomenon
phenomena
Stimulus
stimuli
Parenthesis
Parentheses
Erratum
Errata
Focus
Foci/ Focuses
Criterion
Criteria
Genus
genera
Genie
genii, genies
Aquarium
Aquaria
Stratum
Strata

 Here are some plural compound nouns:

son-in-law
sons-in-law
passer-by
passers-by
step-daughter
step-daughters
man-servant
men-servants
on-looker
on-lookers
cupful
cupfulls
commander-in-chief
commanders-in-chief
court-martial
courts-martial
looker on
lookers on
basketful
basketfuls
spoonful
spoonfuls
major-general
major-generals
bystander
bystanders
hanger-on
hangers-on
Dining room
Dining rooms
Runner-up
Runners- up
Governor-general
Governors- general
Woman student
Women students
Grown-up
Grown-ups


 
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