Irregular Plural Nouns worksheet for practice.

Let’s go through each word one by one and write its plural form. Some of these are tricky because they don’t just add “-s” — that’s why they’re called *irregular* plurals!

We’ll do them in order, left column first, then right column.

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Left Column:

1. potato → ends with “o”, often adds “-es” → potatoes
2. goose → changes completely → geese
3. person → becomes people (sometimes “persons” is used, but “people” is more common for groups)
4. fox → ends with “x”, so we add “-es” → foxes
5. knife → ends with “fe”, change to “ves” → knives
6. zoo → just add “-s” → zoos (even though it ends in “o”, it’s not like potato — zoo is short for zoological garden, so regular plural)
7. country → ends with “y” after consonant → change “y” to “i” and add “-es” → countries
8. peach → ends with “ch” → add “-es” → peaches
9. piano → ends with “o”, but many musical instruments just add “-s” → pianos
10. army → ends with “y” after consonant → change “y” to “i” + “-es” → armies
11. elf → ends with “f”, change to “ves” → elves
12. mouse → irregular → mice
13. child → irregular → children
14. tooth → irregular → teeth

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Right Column:

1. match → ends with “ch” → add “-es” → matches
2. party → ends with “y” after consonant → change “y” to “i” + “-es” → parties
3. class → ends with “ss” → add “-es” → classes
4. key → ends with “ey” → just add “-s” → keys (because “y” follows a vowel)
5. foot → irregular → feet
6. deer → same in singular and plural → deer
7. box → ends with “x” → add “-es” → boxes
8. holiday → ends with “day” → just add “-s” → holidays
9. copy → ends with “y” after consonant → change “y” to “i” + “-es” → copies
10. fish → usually stays the same → fish (though “fishes” can be used for different species, but for general use, “fish” is fine)
11. guess → ends with “ss” → add “-es” → guesses
12. wish → ends with “sh” → add “-es” → wishes
13. cherry → ends with “y” after consonant → change “y” to “i” + “-es” → cherries
14. woman → irregular → women

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Final Answer:

potato → potatoes
goose → geese
person → people
fox → foxes
knife → knives
zoo → zoos
country → countries
peach → peaches
piano → pianos
army → armies
elf → elves
mouse → mice
child → children
tooth → teeth

match → matches
party → parties
class → classes
key → keys
foot → feet
deer → deer
box → boxes
holiday → holidays
copy → copies
fish → fish
guess → guesses
wish → wishes
cherry → cherries
woman → women