Which one is correct?
or
Both are correct. In negative sentences both so - as and as - as can be used: I am not so/as old as he. CB
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Both are correct. In negative sentences both so - as and as - as can be used: I am not so/as old as he.
CB
Writers are usually advised to use 'so' with a negative in those kinds of sentences, and Google Ngrams shows that 'so' occurs more often in that context than 'as'.
Nevertheless, both are acceptable.
CJ