我知道有do as much as sb can的用法

do as much as possible/sb can (much在这里是代词,代替不可数的东西.这里是某人做的事）
as...as...（……一样……）有多种用法：
1、系动词+as+形容词+as+其他成分
She was as angry as me.她和我一样生气.（她生气的程度跟我一样.）
2、行为动词+as+副词+其他成分
She eats as slowly as a small child.她吃得跟一个小孩子一样慢.
3、行为动词+as+名词（作行为动词的宾语,这个名词前面可以有形容词修饰）+其他成分
She wrote as good books as him.她写的书跟他的一样好.
She wrote as many books as him她写的书跟他的一样多.
He does as many as vetigations as he can.写错了,多写了一个as,正确说法是 He does as many vetigations as he can.这里as与many无关,many是修饰vetigations的.vetigations是可数名词的复数,如果这里是一个不可数名词,则要用much.