"not as ... as" vs "not so ... as"

[Penuel]

Hello,

please let me know which is correct and why, and is there any differences in use of NOT AS...AS and NOT SO....AS.

The movie isn't as good as the book / The movie isn't so good as the book.

thanks.

[Skrej]

Hi Penuel,

In your example, 'as good as' is correct.. "The movie isn't as good as the book." (By the way, I've found this to be true about 99% of the time!)

'As good as' is the phrase used for comparing two things.

"good/not so good" can be used to describe a particular thing, (The movie isn't so good), but not for comparison.
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