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Plurals

Most nouns are pluralized by adding -s.
Snake - Snakes
Ski - Skis
Words that end in -ch, x, s or s-like sounds, need an -es for the plural
Witch - Witches
Box - Boxes
Gas - Gases
Bus - Buses
Kiss - Kisses
Jones - Joneses

There are several nouns that have irregular plural forms. A lot of these nouns come from German

Child - Children
Woman - Women
Man - Men
Person - People
Goose - Geese
Mouse - Mice
Barracks - Barracks
Deer - Deer
There are nouns that maintain their Latin or Greek form in the plural.
Nucleus - Nuclei
Syllabus - Syllabi
Focus - Foci
Fungus - Fungi
Thesis - Theses
Crisis - Crises
Phenomenon - Phenomena
Index - Indices (indexes)
Criterion - Criteria
Cactus - Cacti (cactuses)
Appendix - Appendices (appendixes)
Nouns that appear plural but are singular
News
Gymnastics
Economics
(can also be plural)
Mathematics
Statistics
Numerical expressions are usually singular
Fifty thousand dollars
One-half of the students
Most of the people
Fifty percent of the apples
Nouns that seem singular but are plural
Pants
Scissors
Glasses
Spelling

Words that end in -y, change the y to an i and add es

Baby - Babies
Gallery - Galleries
Reality - Realities

This rule does not apply to names: Kennedy - Kennedy's

Words that end in O
Sometimes add an -es -
Potato - Potatoes
Hero - Heroes
Sometimes don't -
Memo - Memos
Cello - Cellos
when a vowel precedes the O -
Stereo - Stereos
Plurals of words that end in -f or -fe usually change the f sound to a v sound and add s or -es
Knife - Knives
Leaf - Leaves
Hoof - Hooves
Self - Selves
Life - Lives
Elf - Elves
Exceptions:
Dwarf - Dwarfs
Roof - Roofs
Collective Nouns
Collective Nouns are singular when we think of them as groups and plural when we think of the individuals acting within the whole.
Audience
Band
Class
Family
Flock
Group
Kind
Lot
[The] Number
Committee
Crowd
Dozen
Heap
Herd
Jury
Public
Staff
Team
Example sentences
Singular
Plural
A dozen eggs is enough to make a cake.
A dozen of my friends are coming over.
The jury delivers its verdict.
The jury came in and took their seats.
Metallica is a good band
The Beatles were a good band
The number of students here is increasing
A number of people are coming over tonight
Sports teams are plural in America and singular in England
America
England
The Yankees are a good team
Manchester United is a good team
Apostrophes are used only with letters and words
A - A's
And - And's
Practice - Make the words plural
1) Child
7)  Teaspoonful
13)  Soliloquy
2)  ATM
8)  George
14)  Potato
3)  Woman
9)  Kennedy
15)  Elf
4)  Son-in-law
10)  Basis
16)  Buffalo
5)  Criterion
11)  Fly
6)  Also-ran
12)  Ski