Irregular Plural Nouns

What Is an Irregular Noun?

Most nouns form the plural by adding -s or -es.
BUT… irregular nouns do not follow these rules.

They change in different or surprising ways.

Examples:

• man → men

• child → children

• tooth → teeth

Common Irregular Nouns

Here are some of the most common ones:

Irregular Nouns That Stay the Same

Some irregular nouns don’t change at all in the plural!

Examples:

• sheep → sheep

• deer → deer

• fish → fish

• moose → moose

Sentence example:
We saw three deer in the forest.

“Switch the Vowel” Irregulars

Some irregular nouns change their vowel to make the plural.

Examples:

• foot → feet

• tooth → teeth

• goose → geese

• mouse → mice

These are tricky because the letters change inside the word.

Sorting Activity – What Kind of Irregular?

Directions: Put each noun under the correct category.

Words: sheep, children, feet, geese, moose, people, mice, deer