Bound morphemes include two types: roots and affixes.
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Almost every word in every language is composed of one or more morphemes.
A. 对
B. 错
The allomorph is an abstract unit.
A. 对
B. 错
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.
A. 对
B. 错
Prefixes usually modify the part of speech of the original word, not the meaning of it.
A. 对
B. 错