Irregular Plural Nouns - Worksheets - Academy Worksheets - Free Printable

Let’s solve this step by step.

We’re working on plural nouns — that means turning one thing into more than one thing. The worksheet gives us rules for different kinds of nouns, and we need to apply those rules to write the correct plurals.

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First, let’s look at the table with the rules:

1. Regular nouns → just add “s”
Example: cat → cats

2. Nouns ending in s, ss, ch, sh, x, z, o → add “es”
Example: fox → foxes

3. Nouns ending in a consonant + y → change “y” to “i” and add “es”
Example: butterfly → butterflies

4. Nouns ending in f or fe → change “f” to “v” and add “es”
Example: wolf → wolves

Now, let’s use these rules to fill in the blanks.

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Part 1: Write the plural forms of these nouns.

Left column:

- box → ends in “x” → add “es” → boxes
- library → ends in “y”, and before “y” is “r” (a consonant) → change “y” to “i” and add “es” → libraries
- tax → ends in “x” → add “es” → taxes
- class → ends in “ss” → add “es” → classes
- patch → ends in “ch” → add “es” → patches
- echo → ends in “o” → add “es” → echoes

Right column:

- loaf → ends in “f” → change “f” to “v” and add “es” → loaves
- bus → ends in “s” → add “es” → buses
- worry → ends in “y”, and before “y” is “r” (consonant) → change “y” to “i” and add “es” → worries
- dictionary → ends in “y”, and before “y” is “n” (consonant) → change “y” to “i” and add “es” → dictionaries
- pile → regular noun → just add “s” → piles
- flash → ends in “sh” → add “es” → flashes

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Part 2: Write the correct plural form of the noun in parentheses.

Sentence 1:
“During the Ice Age many ____________ (variety) of ____________ (animal) lived in Europe.”

- “variety” → ends in “y”, and before “y” is “t” (consonant) → change “y” to “i” and add “es” → varieties
- “animal” → regular noun → add “s” → animals

So:
→ varieties, animals

Sentence 2:
“____________ (Wolf), ____________ (bear), and wild ____________ (horse) roamed the continent.”

- “Wolf” → ends in “f” → change “f” to “v” and add “es” → Wolves
- “bear” → regular → add “s” → bears
- “horse” → regular → add “s” → horses

So:
→ Wolves, bears, horses

Sentence 3:
“These Ice Age ____________ (mammal) were hunted with stone ____________ (ax), ____________ (knife), and ____________ (spear).”

- “mammal” → regular → add “s” → mammals
- “ax” → ends in “x” → add “es” → axes
- “knife” → ends in “fe” → change “f” to “v” and add “es” → knives
- “spear” → regular → add “s” → spears

So:
→ mammals, axes, knives, spears

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Final Answer:

Part 1:
Left column: boxes, libraries, taxes, classes, patches, echoes
Right column: loaves, buses, worries, dictionaries, piles, flashes

Part 2:
1. varieties, animals
2. Wolves, bears, horses
3. mammals, axes, knives, spears