题目内容
The smallest meaningful units that can be used freely all by themselves are free morphemes.
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Bound morphemes include two types: roots and affixes.
Almost every word in every language is composed of one or more morphemes.
The allomorph is an abstract unit.
The existing form to which a derivational affix can be added is called a stem, which can be a bound root, a free morpheme, or a derived form itself.
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