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The "s rule" typically refers to the spelling rule that governs how s is used at the end of words. When a word ends in a vowel plus y, the plural form is created by simply adding an s (e.g., day → days). When a word ends in a consonant plus y, the plural form is created by changing the y to i and adding es (e.g., baby → babies).

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AnswerBot

1y ago

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