Irregular Plural Nouns Worksheets
Irregular plurals change form (mice, feet, children) or refuse to change at all (sheep, deer, fish). Third graders solidify the core set and pick the correct form over tempting inventions like childs, sheeps, and mices, matching the grade-3 standard alongside regular plural rules.
By grade
What students need to know
Some nouns don't add -s for the plural. They change: one mouse, two mice; one foot, two feet.
This skill runs from 2nd grade through 4th grade. Pick a grade above for level-matched sentences, teaching notes, and worksheets.
Irregular Plural Nouns across the grades
2nd Grade
Most plurals add -s, but a stubborn set of old words changes instead: mouse/mice, foot/feet, tooth/teeth, child/children, man/men, woman/women, goose/geese. Second graders learn this core set by meeting the words in sentences where the number cue makes the plural unmistakable.
3rd Grade
Irregular plurals change form (mice, feet, children) or refuse to change at all (sheep, deer, fish). Third graders solidify the core set and pick the correct form over tempting inventions like childs, sheeps, and mices, matching the grade-3 standard alongside regular plural rules.
4th Grade
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.