Choctaw verbs display a wide range of inflectional and derivational morphology.
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Derivational morphology changes the meaning of words by applying derivations.
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Ottawa has complex systems of both inflectional and derivational morphology.
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Simple derivational morphology has also been identified.
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Both nouns and verbs have complex derivational morphology.
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Derivational morphology modifies the meaning of verbs in a way similar to that expressed by adverbs in English.
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As a result, these augmentations are part of the system of derivational morphology, not part of the inflectional system.
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The study of derivational morphology can be quite complicated, as the classes of words that an affix apply to are not always clearcut.
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I-mutation is particularly visible in the inflectional and derivational morphology of Old English, since it affected so many of the Old English vowels.