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'I keep several mice and this is the bravest mouse that I own'. Note that 'mice' is a collective noun for 'mouse'.

Nouns (Irregular Plural) 01

Some nouns don’t add -s or -es to make plurals. This KS3 English quiz explores irregular plurals, including Latin/Greek forms and exceptions you’ll meet in reading and exams.

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(quiz starts below)

Fascinating Fact:

Cactus has two plurals, cacti and cactuses, the shop sold five cacti this morning.

In KS3 English, you’ll learn how irregular plurals work. Some change the vowel (mouse → mice), some change the word (child → children), some keep the same form (sheep → sheep), and some keep classical endings (cactus → cacti/cactuses).

Key Terms

Irregular plural: A plural that does not follow the usual -s or -es rule (e.g., man → men).
Classical plural: A plural borrowed from Latin or Greek (e.g., cactus → cacti, criterion → criteria).
Invariant noun: A noun whose singular and plural look the same (e.g., fish, sheep).

Frequently Asked Questions (Click to see answers)

What is an irregular plural in English?

An irregular plural does not simply add -s or -es. Examples include child → children, tooth → teeth, mouse → mice, and sheep → sheep.

Is it correct to say cacti or cactuses?

Both are correct. Cacti follows the Latin pattern; cactuses follows regular English rules. Choose one style and use it consistently in your writing.

How can I spot irregular plurals in KS3 exams?

Look for vowel changes (man → men), different endings (goose → geese), invariant forms (deer), or classical plurals (bacterium → bacteria).

Try These Related Quizzes

1 .

Find the plural for the following word.
Mouse

Mice

Mices

Mouses

Mouse's

"Mouse's" means "belonging to a mouse"!

2 .

Find the plural for the following word.
Die (a cube used to play board games)

Dice

Dices

Dice's

Dies

One cube is a "die" although we usually say "dice" anyway

3 .

Find the plural for the following word.
Dormouse

Dormice

Dormices

Dormouses

Dormouse's

Remember that the plural of "mouse" is "mice"

4 .

Find the plural for the following word.
Foot

Feet

Feets

Foots

Foot's

Imagine if the plural of "boot" were "beet"! It's "boots", of course!

5 .

Find the plural for the following word.
Goose

Geese

Geeses

Gooses

Goose's

But "moose" is the same whether singular or plural

6 .

Find the plural for the following word.
Ox

Oxen

Oxen's

Oxes

Oxs

But the plural of "fox" is "foxes"

7 .

Find the plural for the following word.
Child

Children

Childrens

Childs

Child's

Not "childs"!

8 .

Find the plural for the following word.
Gentleman

Gentlemans

Gentleman's

Gentlemen

Gentlesmen

It's easy to remember this one, because the plural of "man" is "men"

9 .

Find the plural for the following word.
Woman

Womans

Woman's

Women

Women's

"Woman's" means "belonging to a woman"

10 .

Find the plural for the following word.
Tooth

Teeth

Teeths

Tooths

Tooth's

But the plural of "booth" is "booths"

You can find more about this topic by visiting BBC Bitesize - What is a noun?

Author: Sue Daish (English Teacher, Principal Examiner & Published Author)

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