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https://www.zhihu.com/question/31370551
Syntax 和 Grammar 有何区别? - 知乎
The subfields of contemporary grammar are phonetics, phonology, morphology, syntax, semantics, and pragmatics. Traditional grammars include only morphology and syntax. In linguistics, Syntax is the study of the rules, or "patterned relations", that govern the way words combine to form phrases and phrases combine to form sentences.