which adverbs can't have a 'not' after them?

[Casiopea]

Originally Posted by dihen

What about 'completely not [adjective]' and 'extremely not [adjective]'?

Max is not extremely well. <not negates extremely)
Max is extremely not well. <not negates well)

[dihen]

Originally Posted by Casiopea

Max is not extremely well. <not negates extremely)
Max is extremely not well. <not negates well)

You didn't say anything about 'completely not [adjective]', so is it incorrect?

[Casiopea]

Max is not completely sure. <emphasis on negating "completely sure">
Max is completely not sure. <emphasis on negating "sure">

[dihen]

So 'something/someone is too not [adjective]', 'something/someone is that not [adjective]', 'something/someone is this not [adjective]', and 'something/someone is so not [adjective]' are still are wrong?

[Casiopea]

'something/someone is too not [adjective]'.
'something/someone is that not [adjective]'
'something/someone is this not [adjective]'
E.g. Sam, is this not your book?

Colloquial
someone/something is so not . . .

Max: Our English teacher is so cool!
Pat: She is so not cool!

[dihen]

So you can never have negative "as ... as" comparisons like "You're as not nice (meaning "as unkind/mean") as he is"?

[Casiopea]

Originally Posted by dihen

So you can never have negative "as ... as" comparisons like "You're as not nice (meaning "as unkind/mean") as he is"?

as. . .as is a set phrase, so "not" negates the set, not individual items within the set. To get that reading, use the prefix un-, like this,

It's as uncommon as it is common.

[dihen]

Are these correct or not?

"I always don't do that" (meaning "I never do that")
"I almost didn't understand" (meaning "I hardly/barely understood")
"I rarely don't go" (meaning "I go quite often" or "I usually go")
"I often don't go" (meaning "I don't go very often")

[dihen]

Originally Posted by dihen

Are these correct or not?

"I always don't do that" (meaning "I never do that")
"I almost didn't understand" (meaning "I hardly/barely understood")
"I rarely don't go" (meaning "I go quite often" or "I usually go")
"I often don't go" (meaning "I don't go very often")

Please, just tell me if those sentences are correct.

[Tdol]

None of them sounds very natural to me.