cqvip:【prescriptive grammar规范语法】A prescriptive grammar is a manual that states rules for how language should be used, rather than how it is used （which is the domain of a descriptive grammar）. Many traditional grammars were of this type, and most manuals of correct usage and ＂style guides＂ still are. Here are some examples of the kind of advice you might find in these：
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