Reference grammars do not always give a full description of the complex mapping between words and constructions. Reference grammars often substitute an enumeration of word classes for a full description of the constructions used to define those word classes, the functions of those constructions, and the range of semantic classes of words that occur in those constructions. Even careful typological analyses often use the same term to describe a semantic class of words and a construction used to describe a word class including that semantic class but not identical to it.
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