一、在英语状语从句学习中，有一种从句是由：原级：as…as（和……一样），not so（as）…as …（和不一样）；比较级：more…than（更）；最高级：The most…in/of， the + 形容词+est…of/in。常用引导词：as（同级比较），than（不同程度的比较）；特殊引导词：the more … the more … ； no … more than；not A so much as B引导的，由这类词引导的状语从句叫做比较状语从句，主要运用于形容词和副词的原级、比较级及最高级的句子之中。

二、1、as/so + 原级 + as；它的意思是， 和......一样,（其中 as/so 是副词,意思是“同样地”,后一个 as 是连词）,如：
My hometown is as/so beautiful as Hangzhou
我的家乡和杭州一样美。
2、no + 比较级 + than ，它的意思是，最多和......一样，只不过，如：
I have no more than two dollars left in my pocket.
我口袋里只剩下两元钱了.（有钱少的含义）
3、not more than,不多于,如：
I have not more than two dollars left in my pocket.
我口袋里顶多还有两元钱.（没有钱多钱少的含义）
4、no less than 不亚于,至少和...一样,如：
He has got no less presents than I did last time.
他收到的礼品不亚于我上次收到的.（有收到多的含义）
5、not less than 不少于,如：
He has got not less presents than I did last time.
他收到的礼品不少于我上次收到的.（不包含多或少的含义）
6、比较级 + than,比...优上,如：
Our class is bigger than yours.
我们班的规模比你们的大.
7、the 比较级 + the 比较级,越如何就越如何,如：
The more we can do for you,the happier we will be.
为你们做得越多我们就越感到高兴.
8、less + 原级 + than,不如,比...较差,如：
This kind of food is less expensive than that one.这种食品不如那一种贵.
9、not so + 原级 + as,不如,不及,如：
The film today is not so interesting than the one yesterday.
今天的电影不如昨天的那个有意思.
10、than 比,as/so ...as 和...一样,the more...the more 越...越...

三、比较状语从句从某种角度上说，它也是一种方式状语从句，它通常可和以下关联词来引导as(或so)...as, than, according as, in proportion as等。
1. He woke up as suddenly as he had fallen asleep.
他醒来得和入睡一样突然。(第一个as是副词)
2. I have never seen so much rain as fell that February.
我从未见过像那个二月那么多雨。(否定结构常用so…as, 也可用as... as)
3. Man developed earlier than people think.
人类的出现比人们所想的要早。
4. He moves more slowly than his sister does.
他行动起来比他妹妹慢。
5. The youth of today are better off than we used to be.
今天的年轻人比我们过去的境况要好。
6. You may go or stay, according as you decide.
是去是留由你自己决定。
7. You will be praised or blamed according as your work is good or bad.
你受表扬还是责备得看你的工作好坏决定。
8. Men are happy in proportion as they are virtuous.
人之幸福与德行成正比。
9. Some people are happy in proportion as they are noticed.
有些人越受到注意就越高兴。
10. This book is the most interesting of the three.
这本书是三本中最有趣的。
11. This road is the busiest street in our city.
这条路是我们城市最繁忙的街道。
12. Food is to men what oil is to machine.
食物之于人,犹如油之于机器。