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Plural Nouns worksheet for students to practice forming plural forms of nouns with examples and exercises.

Plural Nouns worksheet with a table showing rules for forming plurals, exercises for writing plural forms, and fill-in-the-blank sentences with a mammoth illustration.

Plural Nouns worksheet with a table showing rules for forming plurals, exercises for writing plural forms, and fill-in-the-blank sentences with a mammoth illustration.

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Show Answer Key & Explanations Step-by-step solution for: Irregular Plural Nouns - Worksheets - Academy Worksheets
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Let’s work through this step by step.

We are given a worksheet about plural nouns — how to make singular nouns into plural (more than one). The top table gives us 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 consonant + y → change y to i and add es
Example: butterfly → butterflies

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

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Now let’s solve each part.

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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 consonant + “y” → change y to i + 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 to v + es → loaves
- bus → ends in “s” → add es → buses
- worry → ends in consonant + “y” → change y to i + es → worries
- dictionary → ends in consonant + “y” → change y to i + es → dictionaries
- pile → regular noun → add s → piles
- flash → ends in “sh” → add es → flashes

✔ All done for Part 1.

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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” → regular noun → add s → varieties? Wait — actually, “variety” ends in “y”, but it’s after a vowel (“e”), so we don’t change the y — we just add s? Let’s check rule.

Wait — our chart says:
“nouns ending in a consonant and y” → change y to i + es.
But if it ends in vowel + y? Then just add s.

Example: boy → boys, toy → toys.

So “variety” → ends in “ty” — “t” is consonant, “y” follows → so yes, change y to i + es → varieties

“animal” → regular → add s → animals

✔️ So: varieties, animals

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

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

✔️ So: Wolves, bears, horses

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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 to v + es → knives
- “spear” → regular → add s → spears

✔️ So: mammals, axes, knives, spears

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All answers verified against the rules provided in the worksheet.

Final Answer:
Part 1 Plurals:
boxes, libraries, taxes, classes, patches, echoes, loaves, buses, worries, dictionaries, piles, flashes

Part 2 Sentences:
1. varieties, animals
2. Wolves, bears, horses
3. mammals, axes, knives, spears
Parent Tip: Review the logic above to help your child master the concept of plural nouns worksheet 5th grade.
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