What is the essential relationship between rules of grammar and a living

What is the essential relationship between rules of grammar and a living

What is the essential relationship between rules of grammar and a living language? Is it primarily descriptive or prescriptive? I am fluent in 3 languages, and it seems to me that native speakers, especially in Chinese, rarely know much about the "rules". Native speakers, instead, are confident. They don't worry that what they say is "wrong", and they're also inventive and creative. American kids are fond of saying about someone that "so-and-so is boss". It seems to me there are many instances now of nouns being converted to adjectives: so-and-so might also be "legend", for instance. Native speakers don't fear that they are "wrong". Does grammar play catch up, like law with technology, or does grammar just unctuously go on insisting that such statements are "wrong"?

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