A recent survey shows that most adolescents eat three times as much protein as they actually need ever day.
红色的部分不也以变成 three times protein as much as 吗？
语法书上说as+adj+a/an+n的结构必须要有a或者an，不然不成立：比如
She is as good a teacher as her sister. （正）
She is as good teacher as her sister.（错）
那题目中的as much protein as 不是违反了as+adj/adv as 的原则吗？同时由于protein不可数所以一定不能用a ，所以更不是as+adj+a/an+n的结构
请问as much protein as 是什么使用方法呢？
much在此是限定词（后位限定词），不是形容词。所以与语法规则并无矛盾。
大家可以说 so much money, too much money, how much money, as much money, more money, a lot more money.
作为表示数目意义的限定词many, much, little, few都可以被程度副词修饰，后接复数名词或不可数名词。所以，可以说 too little water, so little water, as little water, how little water, too many mistakes, so many mistakes, how many mistakes, as many mistakes.
