Why is "Why do not you listen?" grammatically incorrect?

asked 2015-09-04 08:51:50 -0500

We're able to say, in standard US English, "Why don't you listen?" But the uncontracted form -- Why do not you listen? -- is troubling at the very least. I'm uncertain as to whether I would call it grammatically incorrect, but it's certainly not standard. Can someone help explain the rules that govern the usage of do not versus don't?

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