Allomorphs can signal word variation, like singular to plural, without changing meaning. The words 'cat' and 'cats' use different allomorphs for the plural form.
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Pronunciation Guide
Be aware of pronunciation changes; some allomorphs affect how words sound. 'Boxes' has an extra syllable as an allomorph of the '-s' plural marker.
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Not Interchangeable
Allomorphs aren't interchangeable; they're used in specific grammatical contexts. We use '-en' in 'children', not '-s', as its plural allomorph.