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 (fishes appears in science writing about multiple species), learning that "irregular" doesn't mean lawless.
Free printable PDF, aligned to Common Core L.3.1.b. One skill per page, answer key on page two.
Every sheet is one of a kind and prints with a version code, so you can reprint the exact same one later. New version every click.
The kind of sentences you'll get
Circle the letter of the correct plural.
-
Only twelve ______ showed up for the early morning chess club.
people's · peoples · people
Answer: people
- Hundreds of ______ cheered at the parade. peoples · people · people's
- The wind sent piles of dry ______ spinning across the yard. leaves · leafs
Every print draws a fresh mix of sentences at this level, so a make-up test or a second sibling gets a different 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
Ready to print one?
One page, answer key included. A fresh version every time you click.
Aligned to Common Core L.3.1.b. Reviewed by the One More Sheet curriculum team. Content version 68, updated July 2026.