Four pages of plurals that break the rules. On two pages children write the plural of each word from a word bank: one goose, two geese. On two pages each sentence has two choices, the right plural and the one the usual rule would make, such as geese or gooses, and children circle the right one.
Make a class chart of rule breakers in groups: words that change inside (foot, feet), words that stay the same (sheep, deer) and words that change f to v (leaf, leaves). Add to it whenever one turns up in a book.
Play a quick game: you say one, your child says more. One mouse, two mice; one tooth, two teeth. Then switch.
Plural nouns that break the rules: one goose, two geese; one mouse, two mice. Children write each plural from a word bank, then circle the right plural in sentences.
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