How do I ask why a person does not want a certain thing ?
If why don’t you is more like a suggestion, and why you don’t wanna…, as far as I know, is grammatically incorrect, what’s the correct way to say it? **Why won’t you want to… ** ??
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Why don't you X and Why don't you want to X are completely different in meaning.
A: I'm tired
B: Why don't you lie down and rest for a while?
A: Yes - good idea
In this case "Why don't you lie down" is a polite suggestion - it is an idiom, it is not a request for information. Instead of telling someone "Lie down and rest!", which would appear rude, we ask "Why not?"
A: I'm tired but I don't want to lie down
B: Why don't you want to lie down?
A: Because lying down would make my headache worse.
In this case, "Why don't you want" is a request for information. You have told me that you don't want to lie down and now I am enquiring the reason.
Note - Please avoid using "wanna". It's okay in text messages and social media but it should never be used in any kind of formal English.