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Numbers: In English grammar, the number is referred to the count of noun and pronouns.

Example: Book-Books, Table-Tables,

Types:

  1. Singular
  2. Plural

Singular Number: is referred to the count of only one noun or pronoun.

Examples: Student, Teacher, Book, Bottle, etc.

Plural Number: is referred to the count of more than one noun or pronoun

Examples: Students, Teachers, Books, Bottles, etc.

Rules for Numbers:

Rule 1: “s” is used at the end of a singular noun to make it plural

Examples:

SingularPlural
ScaleScales
CatCats
HomeHomes
HorseHorses
TabletTablets

Rule 2: If the word ends with letters s, sh, ch, x and z in the end, “es” is added at the end of the word.

Examples:

SingularPlural
BoxBoxes
BrushBrushes
BeachBeaches
coachcoaches
crosscrosses

 Rule 3: The pronunciation of the word ending with ch is like “k”, just “s” is added at the end

Examples:

SingularPlural
MonarchMonarchs
PatriarchPatriarchs
MatriarchMatriarchs
StomachStomachs
HierarchHierarchs

a) word ending with “y” in the end and a Consonant before that “y”, “i” substitute it and an “es” thereafter.

Examples:

SingularPlural
fairyfairies
LobbyLobbies
kittyKitties
FlyFlies
BabyBabies

b) When there’s a vowel ending with “y”, no need to change it, only “s” is added at the end.

Examples:

SingularPlural
DonkeyDonkeys
ToyToys
DayDays
JoyJoys
PlayPlays

Rule 4:

“v” replaces f or fe and then add an “es” to finish it.

Example:

SingularPlural
thiefThieves
WifeWives
KnifeKnives
WolfWolves
LeafLeaves

a) “es” to be added if the noun is finished by “o” and a consonant place ahead.

Examples:

singularPlural
HeroHeroes
MangoMangoes
ZeroZeroes
PotatoPotatoes
EchoEchoes

b) when there’s a vowel before that “o”, only “s” is enough.

Examples:

SingularPlural
CuckooCuckoos
BambooBamboos
StudioStudios
PortfolioPortfolios
CameoCameos

Exception 1:  there’s an “o” and a consonant ahead of it, some nouns use only “s”.

Examples:

SingularPlural
PhotoPhotos
PianoPianos
RadioRadios
Canto Cantos
Memo Memos

Exception 2: for some, “s” and “es” both are correct.

SingularPlural
MosquitoMosquitos/mosquitoes
CommandoCommandos/commandoes
PorticoPorticos/porticoes
CalicoCalicos/calicoes
MementoMementos/mementoes

Rule 5:

Some require changing the middle-vowel of the word to make it plural.

Examples:

SingularPlural
ManMen
WomanWomen
FootFeet
MouseMice
ToothTeeth

Rule 6:

Some require en, ren and ne to add at last.

Examples:

Singularplural
OxOxen
ChildChildren
BrotherBrethren (brothers also correct)
CowKine (cows also correct)
SisterSistren (sisters also correct)

a)  if “man” means human being in a compound noun(a  noun that contains two or more words that jointly make a single noun), “men”replaces that “man”.

Examples:

singularplural
FishermanFishermen
WorkmanWorkmen
BoatmanBoatmen
Man-of-warMen-of-war
Salesmansalesmen

b)when “man” is just a part of the word, or it  refers to any ethnic group, race or civilian, there comes “s”.

SingularPlural
MussalmanMussalmans
BrahmanBrahmans
GermanGermans
NormanNormans

Rule 7:

“s” to be added when there’s a “ful” in the end.

Examples:

singularplural
HandfulHandfuls
Mouthfulmouthfuls
SpoonfulSpoonfuls
armfulArmfuls
cupfulcupfuls

a)If compound noun contains several words,  “s” comes to join with the main part of that noun.

Examples:

SingularPlural
Brother-in-lawBrothers-in-law
Passers-byPassers-by
Step-brotherStep-brothers
Commander-in-chiefCommanders-in-chief
Maid-servantMaid-servants

b)in some cases,“s” comes in every part to make it so.

Example:

SingularPlural
Lord-justiceLords-justices
Man-servantMen-servants
Woman-servantWomen-servants

Rule 8:

Besides, adding “s” only in the end gets it done for few.

Examples:

SingularPlural
Book-shelfBook-shelves
Book-caseBook-cases
Major-generalMajor-generals
Poet-laureatePoet-laureates
Forget-me-notForget-me-nots

Rule 9:

Some singular nouns have no plural form, only used in the singular.

Examples:

Furniture
Scenery
Issue
Bread
expenditure

Rule 9:

Adversely, some are always used as a plural form.

Examples:

Mumps
Scissors
Trousers
Spectacles
Assets

Rule 10:

Though some nouns seem like singular, actually they are plural.

Examples:

Government
Peasantry
People
Cattle
Mankind

Rule 11:

Similarly, some nouns seem like plural though they are singular.

Examples:

Physics
Politics
Ethics
News
Wages

Rule 12:

Some have the same singular and plural form.

Examples:

Deer
Sheep
Species
Corps
Canon

Rule 12:

In the case of letters, numbers and other symbols, it takes an apostrophe and s to change it.

Examples:

Sam, write your g’s and y’s clearly.
John, add two 5’s and three 8’s.

Rule 13:

There is no specific rule for changing the number of pronouns. It’s all about memorizing.

Singularpluralsingularplural
IWeHim/herThem
MyOurYourYour
MineOursThisThese
MeUsThatThose
YouYouItThey
He/shetheyHis/hertheir