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English nouns ending in an unvoiced f sound in the singular, but not spelled ff, change the f to a voiced v sound in the plural. Notice that the s of the plural is also voiced to a z in such words. There are other cases of this linguistic rule: the s in house is pronounced as a z in houses. See Verner's Law.

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Q: Why does the plural form of knife change to knives or wife to wives it's the f to v part I am asking about?
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