In English, we don't use " How much wrong you are" we only use " How wrong you are". In a sentence: I can show you how wrong you are. However, instead of saying " How wrong you are" it's easier and much simpler to say "That's not right" or "You re wrong" or "That's incorrect" etc. It is "the people (person) who said" when speaking more formally or writing. But among friends some people may use "that". It isn't necessary to say "I am going to show you how wrong you are" in this context. Just say " That's not right". And then give the correct answer. Hope this help!!!

The only correct phrase will be 'How wrong are you?' :) The quantifier 'much' must refer to something countable, yet the degree to which something is wrong is not something that can be counted in numbers, therefore the quantifier cannot be correctly used together with this phrase. I hope this helps. :)

"Much" is an adverb that is only used to modify a (substantive) noun or a verb -- but never an adjective. The equivalent adverb to modify an adjective is "very." "Wrong" is an adjective, so we could say "how very wrong," among other options.

(1) Both "that" and "who" are totally correct, and I honestly don't see a big difference between them. (2) You wrote, "the restaurant is only famous between the neighborhood" but the word "between" is strange here. I would use "within" instead, because "between" is usually for when something is in the middle of two things. You should write, "the restaurant is only famous within the neighborhood" or perhaps "the restaurant is only well-known within the neighborhood." (3) As others have said, "much" is not correct here. But including "them" isn't exactly necessary. Both ways are grammatically correct (with/without them) but have slightly different meanings. See below: "here's a thread to show them how wrong they are" = You're showing "them". They're seeing it. They feel stupid. ;) "here's a thread to show how wrong they are" = You're showing the world. The world sees how stupid they are. "They" may or may not see it, it doesn't matter, but you've told the world.

Ignore this comment, I made a mistake haha