4th grade irregular plural nouns worksheets
By 4th grade, the set widens to the odd corners: oxen, people, moose, and the f-to-ves crossovers like wolves and knives. Students also meet words where two forms exist, learning that "irregular" doesn't mean lawless.
Free printable PDF worksheet, aligned to Common Core L.3.1.b.
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The kind of sentences you'll get
Circle the letter of the correct plural.
-
The survey team released two hundred young into the restored stream.
fishes · fish
Answer: fish
- At the county fair, nine prize waited to be judged. sheeps · sheep
- Five crossed the highway before dawn, halting traffic for ten minutes. moose · meese · mooses
Every print pulls a fresh set of sentences at this level, so a make-up test or a second sibling never gets the same sheet.
What's on each sheet
- Choose the word. Circle the letter of the correct plural. 10 questions per page.
Every version prints on US Letter or A4, with its answer key on the last page.
How to teach this
The interesting conversations at this level are the edge cases. People versus persons, fish versus fishes, and the -ves family all reward a minute of discussion about how dictionaries record what speakers actually do. If a student asks why English works this way, the honest answer, that the language kept its oldest words' oldest habits, tends to satisfy.
Watch for: Some plurals don't change at all: one sheep, five sheep; one deer, three deer. The number word does all the work. Double-marked forms like mices or feets are never right; the changed word is already plural.
Common questions about irregular plural nouns
- What's the plural of moose?
- Moose. It joins sheep and deer in the unchanging group, and no, meese has never been a word, however satisfying it would be. These no-change plurals make good challenge items because the tempting wrong answer sounds so plausible.
- People or persons?
- People, in nearly all writing a 4th grader will do. Persons survives in legal and technical phrases (missing persons), which is worth mentioning exactly once as trivia. Our items treat people as the correct plural of person.
Related worksheets
- 2nd grade irregular plural nouns A step easier, same skill
- 3rd grade irregular plural nouns A step easier, same skill
- 4th grade adverbs of how, when, and where Same grade, nearby skill
- 4th grade commonly confused words Same grade, nearby skill
- 4th grade comparative and superlative adjectives Same grade, nearby skill
- Irregular plural nouns, all grades The full progression
- All 4th grade English worksheets Every skill at this level
- All 4th grade worksheets Everything at this level
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Aligned to Common Core L.3.1.b. Reviewed by the One more sheet team. Content version 137, updated August 2026.
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