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Singular and Plural Words: 250+ Examples, Rules, A–Z List, Exercises & Answers
Complete Guide to Singular and Plural Nouns in English – Regular Plurals, Irregular Nouns, -s, -es, -ies, -ves Rules, Uncountable Nouns, Compound Nouns, Subject–Verb Agreement, Worksheets and Answers
Victoria Academy – A Canadian International School
Ontario, Canada | Grades 9–12 | BSID #884963
Understanding singular and plural words is one of the foundations of English grammar.
A singular noun refers to one person, place, animal, object, idea or thing.
A plural noun usually refers to two or more.
For example:
book → books
student → students
city → cities
child → children
woman → women
leaf → leaves
The basic idea is simple, but English plural forms are not always formed by adding -s.
Some nouns require:
-es
-ies
-ves
a spelling change;
an irregular plural;
a Latin or Greek plural;
or no spelling change at all.
Understanding these patterns helps students improve:
English grammar;
academic writing;
speaking;
sentence construction;
subject–verb agreement;
reading comprehension;
vocabulary;
editing;
and overall communication.
This complete guide includes 250+ singular and plural examples, rules, exceptions, sentence examples, exercises and answer keys.
Quick Answer: What Are Singular and Plural Words?
Singular
A singular noun refers to one person, place, thing, animal or idea.
Examples:
student
teacher
book
school
city
idea
Example sentence:
The student is reading.
Plural
A plural noun normally refers to two or more people, places, things, animals or ideas.
Examples:
students
teachers
books
schools
cities
ideas
Example sentence:
The students are reading.
Singular vs Plural – Simple Examples
Singular
Plural
book
books
student
students
teacher
teachers
school
schools
apple
apples
box
boxes
class
classes
city
cities
baby
babies
leaf
leaves
child
children
woman
women
tooth
teeth
mouse
mice
sheep
sheep
What Is a Singular Noun?
A singular noun names one person, place, animal, object, thing or idea.
Examples:
Person
student
teacher
doctor
writer
scientist
Place
school
city
country
library
university
Animal
cat
dog
bird
horse
mouse
Thing
book
phone
computer
chair
table
Idea
dream
plan
thought
question
solution
Examples in sentences:
The student completed the assignment.
A teacher entered the classroom.
The library is open.
The computer is working.
An idea can change a project.
What Is a Plural Noun?
A plural noun usually names more than one person, place, animal, object, thing or idea.
Examples:
student → students
teacher → teachers
library → libraries
computer → computers
idea → ideas
Sentences:
The students completed their assignments.
Several teachers attended the meeting.
The libraries are open.
The computers are working.
Good ideas can improve a project.
Why Are Singular and Plural Words Important?
Singular and plural nouns influence other parts of a sentence.
Compare:
THE STUDENT IS READY.
and:
THE STUDENTS ARE READY.
The noun changes:
student → students
The verb also changes:
is → are
Another example:
THE CHILD HAS A BOOK.
Plural:
THE CHILDREN HAVE BOOKS.
Several grammatical elements can change when number changes.
This is why singular and plural nouns are closely connected to:
SUBJECT–VERB AGREEMENT.
How Do We Make Singular Nouns Plural?
There are several major patterns.
Rule 1 – Add -s
Rule 2 – Add -es
Rule 3 – Change consonant + y to -ies
Rule 4 – Some -f / -fe words become -ves
Rule 5 – Some nouns change spelling completely
Rule 6 – Some nouns use irregular endings
Rule 7 – Some singular and plural forms are identical
Rule 8 – Some borrowed words retain Latin or Greek plurals
Rule 9 – Compound nouns may change one main word
Rule 10 – Some nouns are normally uncountable and do not take ordinary plural forms
Let's study each rule carefully.
Rule 1: Add -s to Make Most Nouns Plural
For many English nouns, simply add:
-S
Examples:
Singular
Plural
book
books
pen
pens
pencil
pencils
student
students
teacher
teachers
school
schools
computer
computers
table
tables
chair
chairs
phone
phones
lesson
lessons
course
courses
project
projects
question
questions
answer
answers
More -s Plural Examples
apple → apples
banana → bananas
car → cars
house → houses
tree → trees
flower → flowers
friend → friends
room → rooms
door → doors
window → windows
desk → desks
bag → bags
picture → pictures
idea → ideas
problem → problems
solution → solutions
exam → exams
grade → grades
subject → subjects
university → universities — not this rule; note the spelling change
This reminds us that we should always look at the noun ending before choosing the plural rule.
Rule 2: Add -es to Nouns Ending in Certain Sounds
Nouns ending in:
-s
-ss
-sh
-ch
-x
-z
commonly take:
-ES
Examples of -es Plurals
Singular
Plural
bus
buses
class
classes
glass
glasses
dish
dishes
brush
brushes
match
matches
watch
watches
box
boxes
fox
foxes
quiz
quizzes
More Examples
address → addresses
dress → dresses
kiss → kisses
church → churches
branch → branches
lunch → lunches
sandwich → sandwiches
wish → wishes
flash → flashes
tax → taxes
buzz → buzzes
Why Does Quiz Become Quizzes?
Notice:
quiz → quizzes
The final z is doubled before adding -es.
Similarly:
buzz → buzzes
But students should learn the correct spelling rather than simply assuming every final consonant doubles.
Rule 3: Consonant + Y Usually Changes to -ies
If a noun ends in:
CONSONANT + Y
change:
Y → IES
Examples:
Singular
Plural
baby
babies
city
cities
country
countries
story
stories
family
families
lady
ladies
party
parties
library
libraries
university
universities
activity
activities
More Consonant + Y Examples
company → companies
community → communities
ability → abilities
responsibility → responsibilities
opportunity → opportunities
category → categories
theory → theories
dictionary → dictionaries
memory → memories
difficulty → difficulties
But Vowel + Y Usually Just Adds -s
This is important.
If y comes after a vowel, normally keep the y and add -s.
Examples:
Singular
Plural
boy
boys
toy
toys
key
keys
day
days
way
ways
valley
valleys
journey
journeys
So:
BABY → BABIES
but:
BOY → BOYS
Why?
baby ends in consonant + y.
boy ends in vowel + y.
Rule 4: Some Nouns Ending in -f or -fe Change to -ves
Some nouns ending in:
-F
or:
-FE
change to:
-VES
Examples:
Singular
Plural
leaf
leaves
knife
knives
wife
wives
life
lives
wolf
wolves
shelf
shelves
half
halves
loaf
loaves
calf
calves
thief
thieves
Important: Not Every -f Word Changes to -ves
Some simply add -s.
Examples:
roof → roofs
chief → chiefs
belief → beliefs
chef → chefs
cliff → cliffs
proof → proofs
safe → safes
So students should not use:
F → VES
as an automatic rule for every noun.
Some -f Words May Have More Than One Accepted Plural
English sometimes allows variation.
For example, depending on usage and dictionary preference, certain nouns may appear in more than one plural form.
The safest approach in formal school writing is:
CHECK A RELIABLE DICTIONARY WHEN YOU ARE UNSURE.
Rule 5: Some Nouns Change an Internal Vowel
These are irregular plurals.
Examples:
Singular
Plural
man
men
woman
women
foot
feet
tooth
teeth
goose
geese
mouse
mice
louse
lice
These forms need to be learned individually.
Incorrect:
mans
Correct:
MEN
Incorrect:
tooths
Correct:
TEETH
Rule 6: Some Nouns Use a Different Irregular Ending
Examples:
child → children
ox → oxen
person → people
These are not formed with the ordinary -s rule.
Examples in sentences:
One child is reading.
Three children are reading.
One person entered the room.
Several people entered the room.
Is “Persons” Ever Correct?
Yes.
Although people is the normal plural of person in everyday English, persons can appear in formal, legal or administrative contexts.
Example:
Unauthorized persons are not permitted to enter.
For ordinary communication:
PERSON → PEOPLE
is usually the natural choice.
Rule 7: Some Nouns Have the Same Singular and Plural Form
Some nouns do not change spelling.
Examples:
Singular
Plural
sheep
sheep
deer
deer
aircraft
aircraft
species
species
series
series
salmon
salmon
trout
trout
moose
moose
Examples:
One deer is standing near the trees.
Five deer are standing near the trees.
The spelling stays the same.
The sentence tells us whether the meaning is singular or plural.
What About Fish and Fishes?
Both can be correct, but they are often used differently.
Fish
Usually refers to multiple individual fish.
We saw ten fish.
Fishes
Can be used when referring to different species or types of fish, especially in scientific contexts.
This is a useful reminder:
ENGLISH PLURAL RULES SOMETIMES DEPEND ON MEANING.
Rule 8: Latin and Greek Plural Forms
English has borrowed many academic and scientific words from Latin and Greek.
Some retain traditional plural forms.
Examples:
Singular
Plural
analysis
analyses
basis
bases
crisis
crises
thesis
theses
hypothesis
hypotheses
diagnosis
diagnoses
phenomenon
phenomena
criterion
criteria
bacterium
bacteria
medium
media
curriculum
curricula
nucleus
nuclei
fungus
fungi
alumnus
alumni
Academic Plural Pattern: -is → -es
Examples:
analysis → analyses
basis → bases
crisis → crises
thesis → theses
hypothesis → hypotheses
diagnosis → diagnoses
Notice that pronunciation changes as well as spelling.
-on → -a Pattern
Examples:
phenomenon → phenomena
criterion → criteria
These words commonly appear in academic writing.
Example:
This phenomenon is difficult to explain.
Plural:
These phenomena are difficult to explain.
-um → -a Pattern
Examples include:
bacterium → bacteria
curriculum → curricula
datum → data
However, modern English usage can vary.
For example, data is historically the plural of datum, but in many modern contexts data is also treated as a mass noun.
Academic style may vary by discipline.
-us → -i Pattern
Some Latin-origin nouns have traditional plurals such as:
alumnus → alumni
nucleus → nuclei
fungus → fungi
But do not assume every word ending in -us becomes -i.
For example:
bus → buses
virus → viruses
campus → campuses
status → statuses
So:
DO NOT CREATE LATIN PLURALS BY GUESSING.
Cactus: Cacti or Cactuses?
Both:
CACTI
and:
CACTUSES
are used in modern English.
This illustrates an important principle:
Some borrowed words have both a traditional classical plural and a regular English plural.
Index: Indexes or Indices?
Both forms are used.
Indexes
Common in general contexts, books and publishing.
Indices
Common in some mathematical, scientific and technical contexts.
Meaning and discipline can affect the preferred form.
Medium: Mediums or Media?
Both exist with different common uses.
Media
Often used for communication channels or forms of artistic/technical transmission.
Mediums
Can refer to people claiming to communicate with spirits, and can also occur in particular contexts.
For students:
CONTEXT MATTERS.
Rule 9: Compound Nouns
A compound noun contains more than one word or word element.
In many compound nouns, the principal noun becomes plural.
Examples:
Singular
Plural
mother-in-law
mothers-in-law
father-in-law
fathers-in-law
sister-in-law
sisters-in-law
brother-in-law
brothers-in-law
passer-by
passers-by
editor-in-chief
editors-in-chief
Other Compound Nouns Simply Add -s at the End
Examples:
schoolbag → schoolbags
classroom → classrooms
notebook → notebooks
website → websites
textbook → textbooks
computer screen → computer screens
student ID → student IDs
Again, the structure of the compound determines the plural.
Singular and Plural Possessives Are Different From Plurals
Students often confuse plural -s with possessive apostrophes.
Plural
student → students
Singular Possessive
student → student's
Plural Possessive
students → students'
Examples:
Three students entered the room.
Plural only.
The student's book is on the desk.
One student owns the book.
The students' books are on the desk.
Several students own the books.
Never Use an Apostrophe Just to Make an Ordinary Plural
Incorrect:
book's
when you mean several books.
Correct:
BOOKS
Incorrect:
student's
when you mean several students.
Correct:
STUDENTS
An apostrophe usually signals possession or a contraction—not an ordinary plural.
What Are Countable Nouns?
A countable noun can normally be counted as separate units.
Examples:
one book
two books
three books
one student
two students
one idea
several ideas
Countable nouns usually have singular and plural forms.
What Are Uncountable Nouns?
Some nouns normally refer to substances, concepts or categories that English does not count as separate units in ordinary usage.
Examples:
information
advice
furniture
equipment
knowledge
research
homework
luggage
traffic
music
water
rice
money
Common Uncountable-Noun Mistakes
Incorrect:
informations
Correct:
INFORMATION
Incorrect:
advices
Correct:
ADVICE
Incorrect:
furnitures
Correct:
FURNITURE
Incorrect:
equipments
Correct:
EQUIPMENT
Incorrect:
homeworks
Correct:
HOMEWORK
How Do We Count Uncountable Nouns?
Use units or expressions.
Instead of:
three advices
say:
THREE PIECES OF ADVICE
Instead of:
two equipments
say:
TWO PIECES OF EQUIPMENT
Instead of:
many informations
say:
A LOT OF INFORMATION
or:
SEVERAL PIECES OF INFORMATION
Nouns That Are Usually Plural
Some English nouns commonly appear in plural form.
Examples:
scissors
trousers
jeans
shorts
glasses
binoculars
pliers
clothes
Examples:
THE SCISSORS ARE SHARP.
THESE TROUSERS ARE NEW.
MY GLASSES ARE ON THE TABLE.
How Do We Refer to One Item?
Use:
A PAIR OF
Examples:
a pair of scissors
a pair of trousers
a pair of glasses
Then the head noun is pair.
Example:
THIS PAIR OF SCISSORS IS NEW.
Compare:
THESE SCISSORS ARE NEW.
Words That Look Plural but Are Often Singular
Some nouns end in -s but are usually treated as singular in certain meanings.
Examples:
mathematics
physics
economics
news
measles
Examples:
MATHEMATICS IS IMPORTANT.
Not:
Mathematics are important.
THE NEWS IS INTERESTING.
Not:
The news are interesting.
Words That Can Change Meaning Depending on Singular or Plural
English becomes especially interesting here.
Experience
experience can refer to accumulated knowledge.
experiences can refer to separate events.
Example:
She has teaching experience.
She described her travel experiences.
Paper
paper can mean the material.
papers can mean documents, academic articles or exam papers.
Work
work is often uncountable.
works can refer to artistic or literary creations, or other specialized meanings.
Example:
The work is difficult.
The collected works of the author were published.
Subject–Verb Agreement With Singular and Plural Nouns
A singular subject normally takes a singular verb.
THE STUDENT IS STUDYING.
A plural subject normally takes a plural verb.
THE STUDENTS ARE STUDYING.
Is vs Are
Singular:
The book is interesting.
Plural:
The books are interesting.
Singular:
The child is outside.
Plural:
The children are outside.
Has vs Have
Singular:
THE STUDENT HAS A QUESTION.
Plural:
THE STUDENTS HAVE QUESTIONS.
Singular:
The woman has arrived.
Plural:
The women have arrived.
Does vs Do
Singular:
DOES THE STUDENT UNDERSTAND?
Plural:
DO THE STUDENTS UNDERSTAND?
Singular Present-Tense Verb vs Plural Verb
Notice something that often confuses learners.
Singular noun:
The student reads.
Plural noun:
The students read.
The plural noun has -s, but the plural verb usually does not.
Compare:
ONE STUDENT READS.
TWO STUDENTS READ.
This is a major subject–verb agreement pattern.
Singular Demonstratives vs Plural Demonstratives
Singular
Plural
this
these
that
those
Examples:
THIS BOOK IS NEW.
THESE BOOKS ARE NEW.
THAT STUDENT IS READY.
THOSE STUDENTS ARE READY.
A / An vs Plural Nouns
A and an normally refer to one countable noun.
Correct:
a student
an apple
But not:
a students
an apples
Plural forms may use:
some students
many students
several students
two students
the students
One vs Many
Compare:
one book
two books
one child
three children
one sheep
six sheep
one criterion
several criteria
The number word helps reveal whether the noun is singular or plural.
Singular and Plural Words A–Z
Below is an extended vocabulary list for students.
A
Singular
Plural
actor
actors
address
addresses
animal
animals
answer
answers
apple
apples
article
articles
assignment
assignments
activity
activities
B
Singular
Plural
baby
babies
bag
bags
ball
balls
banana
bananas
beach
beaches
bench
benches
book
books
box
boxes
boy
boys
branch
branches
brush
brushes
bus
buses
C
Singular
Plural
calf
calves
car
cars
category
categories
chair
chairs
child
children
city
cities
class
classes
classroom
classrooms
computer
computers
country
countries
course
courses
crisis
crises
D
Singular
Plural
day
days
deer
deer
desk
desks
dictionary
dictionaries
dish
dishes
doctor
doctors
door
doors
dress
dresses
E
Singular
Plural
ear
ears
editor
editors
egg
eggs
elephant
elephants
emails
exam
exams
example
examples
exercise
exercises
eye
eyes
F
Singular
Plural
family
families
foot
feet
flower
flowers
fox
foxes
friend
friends
fungus
fungi / funguses
G
Singular
Plural
game
games
girl
girls
glass
glasses
goal
goals
goose
geese
grade
grades
group
groups
H
Singular
Plural
half
halves
hand
hands
hat
hats
hobby
hobbies
horse
horses
house
houses
hypothesis
hypotheses
I
Singular
Plural
idea
ideas
image
images
index
indexes / indices
industry
industries
instructor
instructors
interview
interviews
island
islands
item
items
J
Singular
Plural
jacket
jackets
job
jobs
journey
journeys
journal
journals
judge
judges
K
Singular
Plural
key
keys
keyboard
keyboards
kid
kids
knife
knives
knowledge
usually uncountable
L
Singular
Plural
lady
ladies
language
languages
leaf
leaves
lesson
lessons
library
libraries
life
lives
loaf
loaves
M
Singular
Plural
man
men
match
matches
medium
media / mediums
memory
memories
mouse
mice
mother
mothers
mother-in-law
mothers-in-law
N
Singular
Plural
nation
nations
notebook
notebooks
nucleus
nuclei
number
numbers
nurse
nurses
O
Singular
Plural
object
objects
office
offices
opportunity
opportunities
ox
oxen
P
Singular
Plural
page
pages
parent
parents
party
parties
pen
pens
pencil
pencils
person
people
phenomenon
phenomena
photo
photos
piano
pianos
plan
plans
potato
potatoes
project
projects
Q
Singular
Plural
question
questions
quiz
quizzes
quality
qualities
quantity
quantities
R
Singular
Plural
radio
radios
report
reports
research project
research projects
responsibility
responsibilities
room
rooms
roof
roofs
S
Singular
Plural
school
schools
scientist
scientists
series
series
shelf
shelves
sheep
sheep
shoe
shoes
solution
solutions
species
species
story
stories
student
students
subject
subjects
T
Singular
Plural
table
tables
teacher
teachers
test
tests
theory
theories
thesis
theses
thief
thieves
tooth
teeth
tomato
tomatoes
toy
toys
tree
trees
U
Singular
Plural
umbrella
umbrellas
uncle
uncles
university
universities
user
users
V
Singular
Plural
valley
valleys
van
vans
video
videos
village
villages
visitor
visitors
W
Singular
Plural
watch
watches
way
ways
website
websites
wife
wives
window
windows
wolf
wolves
woman
women
word
words
X
Singular
Plural
X-ray
X-rays
Y
Singular
Plural
year
years
youth
youths / youth, depending on meaning
Z
Singular
Plural
zebra
zebras
zoo
zoos
100 Common Singular and Plural Words – Quick List
book → books
pen → pens
pencil → pencils
bag → bags
table → tables
chair → chairs
student → students
teacher → teachers
school → schools
lesson → lessons
course → courses
subject → subjects
test → tests
exam → exams
question → questions
answer → answers
project → projects
report → reports
computer → computers
phone → phones
class → classes
bus → buses
box → boxes
dish → dishes
brush → brushes
watch → watches
match → matches
fox → foxes
quiz → quizzes
address → addresses
baby → babies
city → cities
country → countries
story → stories
family → families
library → libraries
university → universities
activity → activities
opportunity → opportunities
responsibility → responsibilities
boy → boys
toy → toys
key → keys
day → days
journey → journeys
leaf → leaves
knife → knives
wife → wives
life → lives
wolf → wolves
shelf → shelves
half → halves
loaf → loaves
calf → calves
thief → thieves
roof → roofs
chief → chiefs
belief → beliefs
man → men
woman → women
child → children
person → people
foot → feet
tooth → teeth
goose → geese
mouse → mice
ox → oxen
sheep → sheep
deer → deer
aircraft → aircraft
species → species
series → series
phenomenon → phenomena
criterion → criteria
analysis → analyses
basis → bases
crisis → crises
thesis → theses
hypothesis → hypotheses
diagnosis → diagnoses
bacterium → bacteria
nucleus → nuclei
fungus → fungi
alumnus → alumni
mother-in-law → mothers-in-law
father-in-law → fathers-in-law
editor-in-chief → editors-in-chief
apple → apples
banana → bananas
tomato → tomatoes
potato → potatoes
photo → photos
piano → pianos
radio → radios
video → videos
house → houses
flower → flowers
tree → trees
friend → friends
idea → ideas
Singular and Plural Sentence Examples
Example 1
Singular:
THE STUDENT IS READING.
Plural:
THE STUDENTS ARE READING.
Example 2
Singular:
The child plays outside.
Plural:
The children play outside.
Example 3
Singular:
The box is heavy.
Plural:
The boxes are heavy.
Example 4
Singular:
A baby is sleeping.
Plural:
The babies are sleeping.
Example 5
Singular:
The woman teaches mathematics.
Plural:
The women teach mathematics.
Example 6
Singular:
A tooth needs treatment.
Plural:
Several teeth need treatment.
Example 7
Singular:
The sheep is in the field.
Plural:
The sheep are in the field.
Notice that sheep does not change, but the verb does.
Example 8
Singular:
This criterion is important.
Plural:
These criteria are important.
Example 9
Singular:
The phenomenon requires explanation.
Plural:
The phenomena require explanation.
Example 10
Singular:
This university offers several programs.
Plural:
These universities offer several programs.
Common Singular and Plural Mistakes
Mistake 1 – Adding -s to Every Noun
Incorrect:
childs
Correct:
CHILDREN
Incorrect:
mans
Correct:
MEN
Incorrect:
mouses
Correct:
MICE
Mistake 2 – Forgetting -es
Incorrect:
boxs
Correct:
BOXES
Incorrect:
classs
Correct:
CLASSES
Mistake 3 – Keeping Y After a Consonant
Incorrect:
citys
Correct:
CITIES
Incorrect:
babys
Correct:
BABIES
Mistake 4 – Changing Vowel + Y Incorrectly
Incorrect:
boies
Correct:
BOYS
Incorrect:
keies
Correct:
KEYS
Remember:
VOWEL + Y → ADD S
Mistake 5 – Applying -ves to Every -f Word
Incorrect:
rooves
Standard modern plural:
ROOFS
Incorrect:
chiefves
Correct:
CHIEFS
Mistake 6 – Making Uncountable Nouns Plural
Incorrect:
informations
Correct:
INFORMATION
Incorrect:
advices
Correct:
ADVICE
Incorrect:
furnitures
Correct:
FURNITURE
Mistake 7 – Using Singular Verbs With Plural Subjects
Incorrect:
The students is ready.
Correct:
THE STUDENTS ARE READY.
Mistake 8 – Using Plural Verbs With Singular Subjects
Incorrect:
The student are ready.
Correct:
THE STUDENT IS READY.
Mistake 9 – Using Apostrophes for Ordinary Plurals
Incorrect:
book's
if you mean multiple books.
Correct:
BOOKS
Mistake 10 – Forgetting That Some Nouns Stay the Same
Incorrect:
sheeps
Correct:
SHEEP
Incorrect:
deers
when referring to the ordinary plural of deer.
Correct:
DEER
Mistake 11 – Saying “A People” When You Mean One Person
Normal singular:
ONE PERSON
Normal plural:
PEOPLE
Example:
A person is waiting outside.
Several people are waiting outside.
Mistake 12 – Treating “News” as Plural
Incorrect:
The news are good.
Correct:
THE NEWS IS GOOD.
Mistake 13 – Saying “One Scissors”
Better:
A PAIR OF SCISSORS
Plural construction:
TWO PAIRS OF SCISSORS
How Can You Tell Whether a Noun Is Singular or Plural?
Ask these questions.
1. Does it refer to one or more than one?
2. Does the word have a plural ending?
3. Is it an irregular plural?
4. Does the verb give you a clue?
5. Do words such as this, these, one, two, many or several give you a clue?
Example:
THIS CHILD IS READING.
Singular clues:
this
child
is
Now:
THESE CHILDREN ARE READING.
Plural clues:
these
children
are
Exercise 1 – Change Singular to Plural
Write the plural form.
book
student
box
class
baby
city
boy
leaf
wife
roof
child
woman
foot
tooth
mouse
sheep
deer
analysis
criterion
phenomenon
Answers – Exercise 1
books
students
boxes
classes
babies
cities
boys
leaves
wives
roofs
children
women
feet
teeth
mice
sheep
deer
analyses
criteria
phenomena
Exercise 2 – Choose the Correct Plural
1. Child
A. childs
B. children
C. childes
Answer: B
2. City
A. citys
B. cities
C. cityes
Answer: B
3. Box
A. boxs
B. boxies
C. boxes
Answer: C
4. Wife
A. wifes
B. wives
C. wifees
Answer: B
5. Roof
A. roofs
B. rooves
C. roofes
Answer: A
6. Mouse
A. mouses
B. mice
C. mouse
Answer: B
7. Sheep
A. sheeps
B. sheep
C. sheepes
Answer: B
8. Analysis
A. analysises
B. analysi
C. analyses
Answer: C
9. Criterion
A. criterions only
B. criteria
C. criterias
Answer: B for the traditional academic plural.
10. Woman
A. womens
B. women
C. womans
Answer: B
Exercise 3 – Singular or Plural?
Identify each noun.
students
child
women
university
cities
deer
criteria
phenomenon
teeth
sheep
Answers
Plural
Singular
Plural
Singular
Plural
Depends on context
Plural
Singular
Plural
Depends on context
Exercise 4 – Correct the Mistake
1.
Incorrect:
Three childs are playing.
Correct:
THREE CHILDREN ARE PLAYING.
2.
Incorrect:
The womans are teachers.
Correct:
THE WOMEN ARE TEACHERS.
3.
Incorrect:
I need two informations.
Better:
I NEED TWO PIECES OF INFORMATION.
4.
Incorrect:
The boxs are heavy.
Correct:
THE BOXES ARE HEAVY.
5.
Incorrect:
These citys are large.
Correct:
THESE CITIES ARE LARGE.
6.
Incorrect:
The sheeps are in the field.
Correct:
THE SHEEP ARE IN THE FIELD.
7.
Incorrect:
My scissors is on the desk.
Correct:
MY SCISSORS ARE ON THE DESK.
Or:
MY PAIR OF SCISSORS IS ON THE DESK.
8.
Incorrect:
The news are surprising.
Correct:
THE NEWS IS SURPRISING.
9.
Incorrect:
Two tooths are missing.
Correct:
TWO TEETH ARE MISSING.
10.
Incorrect:
The students' is ready.
If no possession is intended:
THE STUDENTS ARE READY.
Exercise 5 – Complete the Sentence
Choose the correct form.
1.
One ______ is waiting outside.
person / people
Answer: person
2.
Several ______ are waiting outside.
person / people
Answer: people
3.
The ______ are studying.
student / students
Answer: students
4.
The ______ is studying.
student / students
Answer: student
5.
Two ______ were running.
child / children
Answer: children
6.
The ______ are very sharp.
knife / knives
Answer: knives
7.
Three ______ were observed.
phenomenon / phenomena
Answer: phenomena
8.
The ______ is useful.
information / informations
Answer: information
9.
These ______ are important.
criterion / criteria
Answer: criteria
10.
A ______ is important.
criterion / criteria
Answer: criterion
Exercise 6 – Subject–Verb Agreement
Choose the correct verb.
The student is / are ready.
The students is / are ready.
The child has / have a book.
The children has / have books.
The news is / are important.
The scissors is / are on the table.
Mathematics is / are useful.
The deer is / are standing alone.
Five deer is / are in the field.
These criteria is / are important.
Answers
is
are
has
have
is
are
is
is
are
are
Exercise 7 – Rewrite the Sentence in Plural Form
1.
The student reads a book.
Plural:
THE STUDENTS READ BOOKS.
2.
The child has a toy.
Plural:
THE CHILDREN HAVE TOYS.
3.
This woman teaches a class.
Plural:
THESE WOMEN TEACH CLASSES.
4.
The baby is sleeping.
Plural:
THE BABIES ARE SLEEPING.
5.
That mouse is under the table.
Plural:
THOSE MICE ARE UNDER THE TABLES.
The noun table could remain singular depending on intended meaning, so context matters.
6.
The leaf has fallen.
Plural:
THE LEAVES HAVE FALLEN.
7.
This criterion is useful.
Plural:
THESE CRITERIA ARE USEFUL.
8.
The phenomenon is unusual.
Plural:
THE PHENOMENA ARE UNUSUAL.
Challenge Exercise – Fix the Paragraph
Find the plural and agreement mistakes:
Three student was sitting in the library. They had several book and two dictionarys. One of the childs asked for some informations about different universitys. The teacher gave them useful advices.
Correct version:
Three students were sitting in the library. They had several books and two dictionaries. One of the children asked for some information about different universities. The teacher gave them useful advice.
Notice the changes:
student → students
was → were
book → books
dictionarys → dictionaries
childs → children
informations → information
universitys → universities
advices → advice
Singular and Plural Vocabulary for Academic English
High-school students encounter many nouns beyond basic vocabulary.
Here are useful examples.
Singular
Plural
assignment
assignments
assessment
assessments
course
courses
credit
credits
criterion
criteria
hypothesis
hypotheses
analysis
analyses
thesis
theses
university
universities
scholarship
scholarships
application
applications
prerequisite
prerequisites
transcript
transcripts
qualification
qualifications
requirement
requirements
result
results
experiment
experiments
variable
variables
equation
equations
solution
solutions
These words appear regularly in secondary-school and university-related writing.
Singular and Plural Words in Academic Writing
Correct noun number helps make writing precise.
Compare:
Incorrect:
The research shows several important finding.
Correct:
THE RESEARCH SHOWS SEVERAL IMPORTANT FINDINGS.
Another:
Incorrect:
These criterion are useful.
Correct:
THESE CRITERIA ARE USEFUL.
Another:
Incorrect:
The student analyzed three phenomenon.
Correct:
THE STUDENT ANALYZED THREE PHENOMENA.
Small grammar errors can affect the clarity and professionalism of academic writing.
Singular and Plural Nouns in Science
Science contains many irregular academic plurals.
Examples:
bacterium → bacteria
phenomenon → phenomena
criterion → criteria
analysis → analyses
hypothesis → hypotheses
nucleus → nuclei
formula → formulas / formulae
medium → media
Students interested in:
Biology
Chemistry
Physics
Health Sciences
Engineering
or Research
will encounter many of these words.
Singular and Plural Nouns in Mathematics
Examples:
equation → equations
variable → variables
axis → axes
matrix → matrices
vertex → vertices
radius → radii / radiuses
formula → formulas / formulae
criterion → criteria
Mathematical vocabulary sometimes keeps traditional Latin or Greek plural forms.
Singular and Plural Nouns in Business and Economics
Examples:
company → companies
industry → industries
economy → economies
policy → policies
strategy → strategies
analysis → analyses
criterion → criteria
market → markets
business → businesses
opportunity → opportunities
Learning noun forms supports accurate formal writing across different subjects.
How to Learn Singular and Plural Words Faster
Instead of memorizing hundreds of unrelated words, organize them into patterns.
Group 1
ADD -S
book → books
student → students
Group 2
ADD -ES
box → boxes
class → classes
Group 3
CONSONANT + Y → IES
city → cities
baby → babies
Group 4
SOME F / FE → VES
leaf → leaves
knife → knives
Group 5
IRREGULAR
child → children
mouse → mice
tooth → teeth
Group 6
SAME FORM
sheep → sheep
deer → deer
Group 7
ACADEMIC / CLASSICAL PLURALS
analysis → analyses
criterion → criteria
phenomenon → phenomena
7-Day Singular and Plural Practice Plan
Day 1 – Regular -s Words
Learn and write 30 examples.
Day 2 – -es Words
Practise nouns ending in:
s, ss, sh, ch, x and z.
Day 3 – Y Rules
Compare:
city → cities
boy → boys
Day 4 – F / FE and Irregular Nouns
Practise:
leaf → leaves
roof → roofs
child → children
mouse → mice
Day 5 – Same-Form and Uncountable Nouns
Practise:
sheep
deer
information
advice
equipment
Day 6 – Academic Vocabulary
Practise:
criterion → criteria
analysis → analyses
phenomenon → phenomena
Day 7 – Sentence Practice
Combine plural nouns with correct:
verbs;
demonstratives;
articles;
and pronouns.
A useful learning pattern is:
LEARN → GROUP → USE → CHECK → REPEAT
Frequently Asked Questions About Singular and Plural Words
1. What is a singular noun?
A singular noun names one person, place, animal, object, thing or idea.
Example:
student
2. What is a plural noun?
A plural noun usually names two or more.
Example:
students
3. How do most English nouns become plural?
Usually by adding:
-S
Example:
book → books.
4. When do we add -es?
Nouns ending in sounds commonly written as:
s, ss, sh, ch, x or z
often take -es.
Example:
box → boxes.
5. What happens when a noun ends in consonant + y?
Change:
Y → IES
Example:
city → cities.
6. What happens when a noun ends in vowel + y?
Usually simply add:
-S
Example:
boy → boys.
7. What is the plural of baby?
BABIES
8. What is the plural of city?
CITIES
9. What is the plural of boy?
BOYS
10. What is the plural of box?
BOXES
11. What is the plural of class?
CLASSES
12. What is the plural of leaf?
LEAVES
13. What is the plural of roof?
ROOFS
14. What is the plural of child?
CHILDREN
15. What is the plural of person?
Normally:
PEOPLE
16. What is the plural of man?
MEN
17. What is the plural of woman?
WOMEN
18. What is the plural of tooth?
TEETH
19. What is the plural of foot?
FEET
20. What is the plural of mouse?
MICE
21. What is the plural of goose?
GEESE
22. What is the plural of sheep?
SHEEP
The singular and plural forms are the same.
23. What is the plural of deer?
DEER
The ordinary singular and plural forms are the same.
24. What is the plural of fish?
Usually:
FISH
Fishes may be used when talking about different species.
25. What is the plural of analysis?
ANALYSES
26. What is the plural of phenomenon?
PHENOMENA
27. What is the plural of criterion?
CRITERIA
28. What is the plural of hypothesis?
HYPOTHESES
29. Is “informations” correct?
Normally, no.
Information is generally uncountable.
Say:
some information
or:
pieces of information.
30. Is “advices” correct?
Normally, no.
Use:
advice
or:
pieces of advice.
31. Is “furnitures” correct?
Normally, no.
Use:
FURNITURE
or:
pieces/items of furniture.
32. Is “equipments” correct?
Normally, no.
Use:
EQUIPMENT
or:
pieces of equipment.
33. Is news singular or plural?
Despite ending in -s, news normally takes a singular verb.
THE NEWS IS IMPORTANT.
34. Is mathematics singular or plural?
As the name of an academic subject, it normally takes a singular verb.
MATHEMATICS IS IMPORTANT.
35. Is scissors singular or plural?
Scissors normally takes a plural verb.
THE SCISSORS ARE SHARP.
For one item, say:
A PAIR OF SCISSORS.
36. What is the plural of mother-in-law?
MOTHERS-IN-LAW
37. What is the plural of father-in-law?
FATHERS-IN-LAW
38. What is the difference between plural and possessive?
Plural indicates number:
students
Possessive indicates ownership:
student's
or:
students'
39. Should an apostrophe be used to form a normal plural?
Usually:
NO.
Write:
books
students
computers
not:
book's
student's
computer's
when you simply mean more than one.
40. Why is subject–verb agreement connected to singular and plural nouns?
Because the number of the subject often determines which verb form should be used.
Singular:
THE STUDENT IS READY.
Plural:
THE STUDENTS ARE READY.
Quick Revision Chart
Rule
Singular
Plural
Add -s
book
books
Add -es
box
boxes
Consonant + y → ies
city
cities
Vowel + y → s
boy
boys
Some f/fe → ves
leaf
leaves
f exception
roof
roofs
Irregular
child
children
Vowel change
tooth
teeth
Different ending
ox
oxen
Same form
sheep
sheep
-is → -es
analysis
analyses
-on → -a
phenomenon
phenomena
Compound
mother-in-law
mothers-in-law
Uncountable
information
no ordinary plural
Final Student Tip
Do not try to memorize every plural word independently.
Start with the major patterns:
MOST WORDS → ADD S
S / SH / CH / X / Z SOUNDS → OFTEN ADD ES
CONSONANT + Y → IES
VOWEL + Y → ADD S
SOME F / FE → VES
Then learn the important irregular forms:
CHILD → CHILDREN
PERSON → PEOPLE
MAN → MEN
WOMAN → WOMEN
FOOT → FEET
TOOTH → TEETH
MOUSE → MICE
And remember nouns that stay unchanged:
SHEEP → SHEEP
DEER → DEER
Finally, use the words in complete sentences.
The real goal is not only:
“WHAT IS THE PLURAL?”
It is also:
“CAN I USE THE NOUN CORRECTLY IN A SENTENCE?”
LEARN THE PATTERN.
NOTICE THE EXCEPTIONS.
PRACTISE IN SENTENCES.
CHECK SUBJECT–VERB AGREEMENT.
WRITE CLEARLY.
English Learning at Victoria Academy
Victoria Academy
A Canadian International School
Ontario, Canada | Grades 9–12 | BSID #884963
At Victoria Academy, students completing Ontario high-school courses are encouraged to strengthen English skills that can support both secondary-school learning and future university study.
These can include:
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Grammar
Reading Comprehension
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Correct grammar is not only about passing an English test.
It helps students communicate ideas more precisely.
Understanding the difference between:
student / students
criterion / criteria
analysis / analyses
or:
child / children
helps students produce clearer sentences in English across many subjects.
Why Grammar Matters for High School and University
Strong grammar can support students when they:
write assignments;
prepare essays;
complete research;
answer written assessments;
write laboratory reports;
prepare presentations;
communicate with teachers;
and later complete university applications.
Grammar should therefore move beyond:
MEMORIZING RULES
toward:
USING ENGLISH ACCURATELY AND CONFIDENTLY.
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Victoria Academy
A Canadian International School
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Grades 9–12
BSID #884963
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Students pursuing the Ontario Secondary School Diploma (OSSD) must successfully complete all applicable Ontario graduation requirements based on their individual academic status and approved academic plan.
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