as+副词/形容词+as构成原级比较,as和as之间用形容词或副词的原级.一般说来,第一个as前面的动词是be动词时用形容词,是实义动词时用副词.as...as...与so...as...在意思上是一样的,但是在肯定句中只能用as...as...,在否定句中既可以用as...as...也可以用so...as.特例A、so...as to do sth(如此.以至于.), 如,He is so strong as to lift a big stone. B、not so much .as...是固定结构,翻译过来就是：与其说.还不如说.例如,He was not so much angry as disappointed,他与其说是愤怒还不如说是失望.
希望上面的解释对你有用.