题目内容
“ s ” in “ boys”, “ boy’s” and “it rains” is called ___________affix.
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The morphemes that cannot be used by themselves, but must be combined with other morphemes to form words are called__________ morphemes.
____ is a branch of grammar which studies the internal structure of words and the rules by which words are formed.
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.
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