The two men are running.
-
Irregular Nouns

Definition:

Many nouns have irregular plural forms. Irregular nouns are nouns that completely change the spelling of the word when the word is in plural form.

Example:

one child = two children

one man = three men

one person = four people

one woman = five women



Full List of Irregular nouns
The ending of the noun changes from -us to -i

SINGULAR

PLURAL

alumnus

alumni

cactus

cacti

focus

foci/focuses

fungus

fungi/funguses

nucleus

nuclei

radius

radii

stimulus

stimuli



The ending of the noun changes from
-is to -es

SINGULAR

PLURAL

axis

axes

analysis

analyses

basis

bases

crisis

crises

diagnosis

diagnoses

ellipsis

ellipses

hypothesis

hypotheses

oasis

oases

paralysis

paralyses

parenthesis

parentheses

synthesis

syntheses

synopsis

synopses

thesis

theses



The ending of the noun changes from
-
ix to -ices or ex to eces

SINGULAR

PLURAL

appendix

appendices

index

indeces/indexes

matrix

matrices/matrixes



The ending of the noun changes from
-eu to -eaux

SINGULAR

PLURAL

bureau

bureaus/bureaux



The ending of noun changes to -en

SINGULAR

PLURAL

child

children

man

men

ox

oxen

woman

women



The ending of the noun changes to -a

SINGULAR

PLURAL

bacterium

bacteria

corpus

corpora

criterion

criteria

curriculum

curricula

datum

data

genus

genera

medium

media

memorandum

memoranda

phenomenon

phenomena

stratum

strata



Nouns that have no change

SINGULAR

PLURAL

deer

deer

fish

fish

means

means

offspring

offspring

series

series

sheep

sheep

species

species



The middle of the noun changes from
-
oo to -ee

SINGULAR

PLURAL

foot

feet

goose

geese

tooth

teeth



The ending of the noun changes from
-a to -ae

SINGULAR

PLURAL

antenna

antennae/antennas

formula

formulae/formulas

nebula

nebulae

vertebra

vertebrae

vita

vitae



The ending of the noun changes from
-ouse to -ice

SINGULAR

PLURAL

louse

lice

mouse

mice

Her feet are in pain.
 
Writing Exercise
You must change the regular noun to an irregular noun. Please practice your writing skills by using a pencil and paper for this exercise.
EX: 1.
man =
2.
child =
3.
woman =
4.
mouse =
5.
fish =
6.
sheep =
7.
tooth =
8.
curriculum =
9.
deer =
10.
louse =

 

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