题目内容

____ is a branch of grammar which studies the internal structure of words and the rules by which words are formed.

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Words like “open”, “opens”, “opened” and “opening” share the same ____, which is postulated as the abstract unit underlying the smallest unit in the lexical system of language.

Major lexical categories are ____categories in the sense that new words are constantly added.

"Teacher-student" is a _____ compound.

A lexeme can be understood as a family of words that differ only in their grammatical ____.

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