the very notion 點解?

"The very notion" means "just the concept itself" [單是概念本身]

"the very notion of a sentence in conversation is problematic"
在交談中用完整的句子，單是概念上己經是有很大的問題。


2010-09-26 09:54:30 補充：
In this sentence, "very" is used as an adjective to mean "mere" (or "just").
see entry#3 in the referenced dictionary below.

意思是當對話時用上寫句子的「意識」/「構想」/「結構」時便會成為問題。

notion一般是表達某一種意念或思維，在這句子中是想表達寫作的句子結構跟對話(會話)的句子結構不能相同的，這個notion是指文法上結構或句法上的處理做法。

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very (adjective形容詞)= the same 同一個, 相同的
notion (n) =概念, 意見
the very notion =(使用/以)同一個概念
the very notion of a sentence =以同一個句子概念
In contrast, the very notion of a sentence in conversation is problematic.
相反地, 以同一個句子概念,用於對話時是有疑難的。

In writing, sentences are complete and many are long and structurally complex. In contrast, the very notion of a sentence in conversation is problematic. (在寫作，句子是完整的，很多是長期和複雜的結構。與此相反，這個概念在談話的一個句子是有問題的。)