请问个语法问题，谢谢！

[size=1em]刚考完GMAT，VABAL44，受惠于CD很久，也希望对后人能栽点树，我想就我对比较的认识写点东西。我把OG上所有的比较都总结了一下，发现GMAT比较是有家规的，看似花样百出，实际是有章可循的，看下题
OG19
请大家分析以下比较在ETS看的含义
Rice has protein of higher quality than wheta does.(主语比较，Rice 与wheat比）
意义：米有高质蛋白质，麦没有。
Rice has protein of higher quality than of lower quality(介宾比较，of higher 与 of lower比）
意义：米有高质蛋白质而非低质蛋白质
Rice has protein of higher quality than that in wheat(宾语比较，protein 与protein(that指代)比
Rice has protein of higher quality than sugur.（宾语比较，protein 与sugar比）
意义：米中的蛋白质比麦中蛋白质质量高
意义：米中的高质蛋白质比糖多。
Rice has protein of higher quality than usual/everbfore/1000 years ago/people expected(状语比较）
意义：米比通常/经往/多年前/人们预测/的蛋白质质量要高。
下面我们谈比较之庖丁解牛

[size=1em]对主谓宾全的句型
主语比较：  A do sth  than B do.（AB为对等名词，加do是为了显示这是一个可以发出动作的名词，因而确定是主语，进而确定是主语对比）
介宾比较 A do sth of C1 by D1 than of C2 by D2.（C1C2，D1D2对等名词）
宾语比较 A do C1 than C2.(C1C2为对等名词）
状语比较A do sth than usual/everbefore/people expected(直接加状语）
ETS就这几下子，原则就是清楚地指示什么跟什么比。

[size=1em]按照这个原理，对下一种句型只有主谓，没有宾语的句子，因为没有宾语，只可能有主语比较，因而不需要重复do来确认这是一个可发出动作的主语，所以其比较形式如下：
I eat faster than you.注意与下句区别
I eat apple faster than you do
如果写成 I eat apple faster than you 按ETS的理解，从语法上就变成我吃苹果比吃你快，成了宾语比较。逻辑上显然不通。

[size=1em]AS族的比较大同小异，as 可单独引导比较，也可以复合成as many as, as hard as 等形式，但ETS宗旨不变，如
Sand road costs twice as many to build as to manintain(类似于介宾比较）
Sand road costs twice as many to build as stone road do(主语比较,）
Sand road costs the govement twice as many to build as the residents.(宾语比较）
ETS考过AS比较的习惯用法（不受上述限制，如下）
AS poor as they are, they can ont afford a car.
They have 800million students, as many as have enrolled in our school.
(注意以上都是用逗号隔开的句子，AS在这里的作用更类似连词，连接一个主句和一个从句）

[size=1em]注意AS有时不表比较的如as you word hard, you will pass the exam.表原因了。

[size=1em]There be 句型等同于一般的主谓宾俱全的句型
OG89
There is one PC for every 32 pupils in American four time as many as there were four years ago(主语比较)
There is one PC for every 32 pupils in American  four time as many as  DVD player(宾语比较)
There is one PC for every 32 pupils in American four time as many as  for school teachers.(介宾比交)
There is one PC for every 32 pupils in American four time as many as  in china(介宾比较)

[size=1em]以上的钢领代入EST的OG几乎都成立，在我这次实战中也成立，但GWD中有一题是例外的，也就是说并没有放之四海而皆准的真理，清楚，简洁，合理才是ETS的最高宗旨。