Ok, so I'm supposed to prepare a short presentation about a grammatical oddity in the English language that doesn't seem correct, and yet it is. The topics range from explaining the plural of fish/fishes to the usage of "none of them are/is brave".  I've decided to touch upon the "don't you dare" phrase, but I'm looking for some clarification of why that structure is in usage, and why can't we say "do not you dare" or "don't she dare" (context-wise likely used as a proxy command/threat).  Anyone care to enlighten me?
I don't understand, because if 'don't' is 'do not' then wouldn't the sentence without conjunctions be 'do not you dare' which I'm pretty sure isn't grammatically correct. Like, when we say the term it means something else, certainly not 'do not you dare' anyway. Any ideas on why? I am so glad English is my first language.
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