After 35 years of editing and teaching editing, I can definitely tell you that grammar is important.
But I’m not sure I can say it any better than the National Council of Teachers of English has, so for National Grammar Day 2019, I’ll repeat what they’ve said.
“Why is grammar important?” The National Council of Teachers of English has a good answer:
“Grammar is important because it is the language that makes it possible for us to talk about language. Grammar names the types of words and word groups that make up sentences not only in English but in any language. As human beings, we can put sentences together even as children — we can all do grammar. But to be able to talk about how sentences are built, about the types of words and word groups that make up sentences — that is knowing about grammar. And knowing about grammar offers a window into the human mind and into our amazingly complex mental capacity,” according to the NCTE.
“People associate grammar with errors and correctness. But knowing about grammar also helps us understand what makes sentences and paragraphs clear and interesting and precise.”
(And I say repeat, because I also shared this on this blog for National Grammar Day 2015.)