Bound morpheme
English
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Russian
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Uzbek
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Derived
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Inflection
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Lexical
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Inflectional
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Prefix
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Affixed
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Suffix
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Affixoid
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Postfix
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Interfix
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According to the function of morphemes, they are subdivided into lexeme forming and form forming morphemes in Russian and Uzbek. The main function of lexeme forming morpheme is to form new lexeme from existing one (бодр-ость, бодр-о; ishchi-, ishla-, ishchan). Form forming morphemes serve for forming forms of the same word without changing its lexical meaning (бодр-ый – бодр-ая – бодр-ое; ishchilar, ishchini).
Allomorphy
In the exposition above, morphological rules are described as analogies between word forms: dog is to dogs as cat is to cats, and as dish is to dishes. In this case, the analogy applies both to the form of the words and to their meaning: in each pair, the first word means "one of X", while the second "two or more of X” and the difference is always the plural form -s affixed to the second word, signaling the key distinction between singular and plural entities.
One of the largest sources of complexity in morphology is that this one-to-one correspondence between meaning and form scarcely applies to every case in the language. In English, we have word form pairs like ox/oxen, goose/geese, and sheep/sheep, where the difference between the singular and the plural is signaled in a way that departs from the regular pattern, or is not signaled at all. Even cases considered "regular", with the final -s, are not so simple; the -s in dogs is not pronounced the same way as the -s in cats, and in a plural like dishes, an "extra" vowel appears before the -s. These cases, where alternative forms of a “word” effect the same distinction, are called allomorphy.
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