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- Scarcely a week goes by without some new scandal in the papers. (Scarcely as a part of noun phrase)
- Scarcely does a week go by without some new scandal in the papers. (Scarcely modifies the verb - does go by)
The question is why the the same could not be applied to "NOT"?

All transcripts are not accurate, unfortunately. (Here it modifies the verb rather than the noun.)
--> not are all transcripts accurate, unfortunately.

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Tara2The question is why the the same could not be applied to "NOT"?

"not" can't be used as a sentential adverb (an adverb that modifies an entire sentence or clause).

Tara2All transcripts are not accurate, unfortunately.

A sentence with a universal quantifier on the subject and a negation is usually ambiguous.

To change this, you write one of the following:

Not all transcripts are accurate, unfortunately.
No transcripts are accurate, unfortunately.
All transcripts are inaccurate, unfortunately.

The second and third have the same meaning.

CJ

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Many thanks CJ for the excellent explanation. Emotion: roseEmotion: roseEmotion: rose

Besides, as to "not" can't be used as a sentential adverb (an adverb that modifies an entire sentence or clause)."
The answer to this statement is that "Scarcely " in my examples in #5 is not a sentential adverb either. It does not modify the whole sentence, as has already been demonstrated (Scarcely a week [...] --> it just modifies "a week"). Instead you may find adverbs including "certainly, absolutely, .." sentential adverbs.
See Teaching Sentential Adverbs and Adverbials : Grammar and Beyond

But really the question is,

1. All transcripts are not accurate, unfortunately.

2. Not are all transcripts accurate, unfortunately.

Why 2. is incorrect? Grammatically wrong or the problem is its meaning?

Tara2Why 2. is incorrect? Grammatically wrong or the problem is its meaning?

Grammatically wrong.

The subject is "all transcripts". The verb is "are". There is also the negation "not".

The required order for these elements in a declarative clause is

subject | form of be (are) | negation.

So, all transcripts | are | not

CJ

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Many thanks CJ!!!