沒錯，我就是認為what's 跟 what is 是一樣的意思，他們單純的就只是語言習慣的問題，就像您提出的"what's wrong"跟"what is wrong"，不管在口語上或是謹慎的注意文法上都是一樣的意思，就好像中文中的“怎麼回事“ 跟“怎麼了“，兩者看起來不同，其實是一樣的東西。
當然當你用"what is wrong"時語氣跟態度都有比較溫和的表象，不過在用法跟字義上，是跟"what's wrong"沒有兩樣的。 而您開題時所提到的 "in here" 和 "here" 其實也是同樣的狀況，一個是較為確定，一個是比較casual，兩者都沒錯，也都可以互用，單純是語氣不同，或是用語習慣不同而已。
而您所謂的"不成文的章法"與"約定俗成"的概念，我會把他範圍到"slang"裡，也就是類似中文中的黑話。

真理愈辯愈明.
剛上網找了yahoo知識問答,發現以前就有人提過這類問題.
(1)
http://tw.knowledge.yahoo.com/quest...d=1205073000821
i am here 才對
here 是地方副詞
不能加介係詞
----------
"I`m in here."...應該是沒有這句話
"I'm here."才是正確的
here 的前面不可以加 in
但是, 現在的美國人都不注重文法...所以....有時候會聽到有人"說"in here, in there
而且, 這應該是你聽錯了, 因為有in和沒有 in的音並不會差太多, 對外國人而言, 不容易分辨
(2)
http://tw.knowledge.yahoo.com/quest...d=1306051508207
here 一般為地方副詞　前面通常是不加任合介係詞的
你說有看到here前面加 in
我是記的有一種口語加起強口氣的講法
come in here
get in here
要叫對方進來（屋內）的加強語氣　不過這邊的in 不是here的介係詞　而是
come in 或 get in 這類片語的用法
---------
here前除了over可加外，其他像on、in等介係詞都不可以加。(over可加可不加)

抱歉,剛貼完文才看到你的回應.
就here跟in here的問題,我剛貼了找到的東西,我查日期,看到那是2005/2006的留言,不知道你看過後的感想如何?
另外就what is wrong的東西來講,我查到的用法,都是類似"什麼地方有錯誤?"或"什麼地方不對勁?"的意義.而我查what's wrong的用法,則都為類似"怎麼回事?"的意義.
當然,我仔細想了一下,中文的"怎麼回事?"跟"什麼地方不對勁?"的意義,在某些場合下的確可以互通,再加上"what's wrong"與"what is wrong"的文法架構上完全相同,在這些因素之下,也許這就是造成你我對於"what's wrong"與"what is wrong"的意義之了解,有所不同了吧.
像這樣的討論的確有趣,也有意義,先謝謝了.

你去yahoo(英文)打in here
看會出來什麼句子
再來說你的真理

前面已經有人講in here的here是名詞
I'm here是副詞
你不懂怎麼分辨
那你就都不要用in here
懂得人自然知道怎麼用

in here用法不會有問題 大本一點的字典甚至都有收錄其用法
可以參考如下的解說
http://bbs.chinadaily.com.cn/redire...4&goto=lastpost
--------------------------------------------------------------------
為什麼here前面可以加in？比如：It's like a furnace in here, can we open a window? 這裡熱得像個火爐--咱們打開窗戶好嗎?
是不是特殊用法？

In this sentence, "in" is not a preposition, but an adverb, "in" and "here" mean the same thing.
用中文來解釋吧： 在這個句子中，「 in 」 不是介詞，而是副詞，here 與它是同位語，「in」說明是室內，"here"是強調說明「在這裡」。所以句子可以這麼翻譯：這裡室內像個火爐，咱們把窗戶打開行嗎？
---------------------------------------------------------------------

如果你認為美國人太過口語化 英文不夠標準 (雖然我不這麼認為)
你可以看看列這則BBC新聞提到的副標題 在中間以藍色冒號的句子
http://news.bbc.co.uk/2/hi/asia-pacific/6944750.stm

"The Dalai Lama is in here, but we cannot speak about him"

在google以"in here" 搜尋 也有很多例句可以看

我查朗文英英字典的例句

1
in this place
What are you doing here? Shall we eat here? Come here for a minute. This switch here controls the lights. My friend here will show you the way.

up/down/in/out here

What was she doing up here in the woods? Would you close the window? It's cold in here.
Come on. I'm over here . Will you be back here tonight? There are no good pubs round here . I'm resigning here and now .
2
at this point in time
Spring is here at last. Here is your chance to change your life. Here is where the trouble starts.
3
here and there
scattered around or happening in several different places
The house just needs a bit of paint here and there.
4
spoken here is/are something
also here it is/here they are
a) used when you are giving something to someone, or showing something to them
Here's the money you lent me. Here are some pictures of John when he was little.
b) used when you have found something you were looking for
Have you seen my pen? Oh, here it is.
5
spoken used when you are giving or offering something to someone
Here, have my chair. I don't mind standing.
6
spoken here you are/here you go
used when you are giving something to someone
Here you are, a boxful of tools. 'Here you go.' Callum handed her a glass of orange juice.
7
spoken at this point in a discussion
Here I'd like to add a note of caution. There is no space to discuss this issue here. I'm not sure what you mean here.
8
spoken here goes!
also here we go
used when you are going to try to do something difficult or dangerous, and you do not know what will happen
I've never ridden a motorbike before, so here goes!
9
spoken here we go
used when you are starting to do something or when something is starting to happen
Right, here we go, the game's starting.
10
spoken here's to somebody/something
used when you are going to drink something to wish someone good luck, show your respect for them etc
Here's to the happy couple. Here's to your new job.
11
spoken here he/she etc is
also somebody/something is here
used to say that someone or something has arrived
Here they are, late as usual. Ah, look - here's the postman. Tony's here for his messages.
12
spoken here we are
used when you have finally arrived somewhere you were travelling to
Here we are - home at last.
13
spoken here comes somebody/something
used when you can see something or someone arriving
Here comes lunch.
14
spoken British English used to get someone's attention or to show that you are annoyed
Here! Just what do you think you're doing?
15
here we go again
informal used when something unpleasant is beginning to happen again
Most of us are peaceful and decent, but here we go again, in our fifth war of this century.
16
here to stay
if something is here to stay, it has become a part of life and will continue to be so
Mobile phones are definitely here to stay.
17
here, there, and everywhere
informal in many different places
I spent the weekend driving the kids here, there, and everywhere.
18
neither here nor there
not important
You never liked him much, did you?' 'What I think about him is neither here nor there. He's your friend.'
19
the here and now
the present time
in the here and now
To be able to live fully in the here and now, one must first learn how to honour the past.
20
somebody/something is here to do something
used to say what someone or something's duty or purpose is
We're here to serve you.
21
here he/she etc is (doing something)
used to describe the present situation, especially one you did not expect to happen
I didn't think I'd ever be able to afford it, but here I am sitting in my own fitted kitchen.

語言是活的，是與時俱進的
腦筋轉不過來還說斷言別人是錯的 那就令人搖頭了

冷m，難得你說這麼多話，而且還是英文的

花點時間找找牛津或朗文字典就夠了, 哪來的愈辯愈明？
樓主應該買一本一邊看 e4kids 時一邊查