Multiple choice

Plural of the word 'tooth' is

  1. teeth

  2. teethed

  3. tooths

  4. toothed
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A Correct answer
Explanation

Teeth is the irregular plural of tooth, following the pattern of Germanic nouns that change their internal vowel rather than adding -s or -es. This is a class 2 mutation where oo changes to ee. Regular pluralization rules don't apply here; you must memorize these irregular forms.

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