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形容词和副词的比较等级的用法
1）原级比较：表示两者程度相同。用句型as+形容词/副词+as表示，否定名式为：not as/so+形容词/副词as。 如：
Dick is as tall as his brother.
Tom speaks as quickly as his cousin.
I have never seen a person as / so clever as he is.
2）比较级：
A. 表示A超过B。此时使用形容词和副词的比较等级。如：
Our classroom is brighter than yours.
Dogs run faster than rabbits.
I don’t think math is more important than physics.
B. 表示A不如B。 用句型：less+形容词/副词的原级表示。如：
Rabbits ran less fast than dogs.
Jenny is less clever than her sister.
It rains less often here in autumn than in spring.
3）形容词和副词比较级的特殊用法
A. 越来越…… 如：
You are growing taller and taller.
你越长越高了。
English is becoming more and more important.
英语越来越重要了。
B. 越……， 越……  如：
The harder you push, the more quickly that cart will move.
你越使劲推，车就越跑的快。
The more careful you are, the better you will do in the exam.
你越小心，就会考得越好。
The more you practice, the more fluently you will speak.
你练得越多，讲得就越流利。
C. 表示两者之中比较……的一个，用of 引导，比较级前加上the。 如：
Jack is the taller of the two brothers.
杰克是兄弟两中较高的一个。
This is the bigger of the two rooms.
这个房间是两个中较大的一个。
D. no more than表示“只；不超过；不多于”，相当于only。如：
His whole school added up to no more than one year.
他所接受的学校教育不过一年。
She has no more than one yuan in her pocket.
她兜里只有一块钱。
E. no more…than 表示“……一样不……”；而not more…than则表示“不像……那样”，相当于“not so …as”。如：
Hs is feeling no better than yesterday.
他觉得不比昨天好多少。
She is not more generous than her younger sister.
她不如她妹妹那样慷慨大方。
She is not so generous as her younger sister.
F. no less than表示“多达， ……那样多; 至少, 起码”,  相当于as much /many as, 蕴含这个数是大的；而not less than表示“不少于”, 不强调这个数的大小, 只说明数据本身。如：
    I have no less than ten dictionaries.
   我起码有10本字典。
蕴含“我的词典多”
I have not less than ten dictionaries.
我具有的词典不少于10本。
不含“我的词典多”的意思，只说明一个事实。
G. no less …than表示“不比……差；与……同样地”， 相当于“as …as”。 如：
     She is no less beautiful than her sister.
H. 不用比较级的形容词如：senior, junior, superior, inferior等。如：
     He is three years senior to me.
     他比我大三岁。
     Your knowledge of electronics is much superior to mine.
     你对电子学的知识远远超过我。
I. 比较级的修饰语。这些修饰语通常为副词或短语，置于比较级前面， 说明比较级的程度。这些词有：a little, little, a bit, bit, a lot, a great deal, much, far, rather, slightly, by far, even, still, nearly, almost, any, just, (…)times等。如：
The moon is much smaller than the earth.
The result of the experiment turned out to be even better than expected.
Speak a bit more slowly, please.
The output of the paper mill is three times higher than it was last year.
练习题
1. Bob never does his homework_____ Mary. He makes lots of mistakes.
A. so careful as    B. as carefully as   C. carefully as    D. as careful as
2.Now air in our town is ____ than it used to be. Something must be done to it.
A. very good  B. much better  C. rather than   D. even worse
3. I feel __ better than yesterday.  A. more  B. very  C. the  D. far
4. China has a large population than __ in the world.
A. all the countries B. every country C. any country D. any other country
5. This book is __ on the subject .
A. the much best B. much the best C. very much best  D. very the best
6. The sick boy is getting __ day by day.
A. worse B. bad C. badly C. worst
7. This necklace looks __ and__ sells__.
A. well, well B. good, nice C. nice, good D. nice, well
8. Doctor Wang ___ heart operation
A. is interested on B. like doing C. does well in D. is good at
9.The population of Shandong is__ than that Sichuan.
A. smaller B. larger C. less D. large
10.I didn’t go shopping yesterday. He didn’t __.
A. so B. either C. too D. neither
1.B 2.D 3.D 4.D 5.B 6.A  7.D  8.C  9.B  10.B