Almost every word in every language is composed of one or more morphemes.
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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
There are rules that govern which affix can be added to what type of stem to form a new word. Therefore, words formed according to the morphological rules are acceptable words.
A. 对
B. 错