4.重读闭音节，末尾只有一个辅音字母，双写这个辅音字母，再加-er/est thin thinner thinnest
2. 其他双音节词或多音节词,在该词前面加-more/most
beautiful more beautiful (the) most beautiful
3. 由形容词加ly构成的双音节词和多音节词,都是在该词前加-more/most.
quickly more quickly (the) most quickly
difficultly more difficultly (the) most difficultly
4. 不规则变化:
good/well better best
bad/badly worse worst
many/much more most
little less least
far farther/further farthest/furthest
(二)形容词比较级和最高级的用法：
1. 原级的用法:
用于两者之间对比，意思为 和 相同
A+v.+as .+形容词原级as B
Tom is as honest as Jack.
Her skin is as white as snow.
My dog is as old as that one.
He is not as (=so) tall as I.
The weather here is not as(=so)cool as the weather in Harbin.
2. 比较级的用法:
1)A+形容词比较级+than+ B
Susan is happier than Jane.
His brother is younger than me.
Beijing is more beautiful than Osaka.
形容词比较级前还可以用much, even, still, a little来修饰。
2)数字+形容词比较级+than
I m two years older than you.
She is a head taller than me.
3)比较级+and+比较级，表示 越来越
The earth is getting warmer and warmer.
China becomes more and more stronger.
4)the +比较级，the +比较级结构，表示 越 就越
The more I study it, the more I like it.
5)which/who +is +比较级
Which city is bigger, Beijing or Tianjin?
Who is happier, you or me?
3. 最高级用法：
用于三者及以上的人或事物的比较,最高级前加the，最高级前有物主代词，序数词和名词所有格时，不加定冠词，后面跟带in或of表范围的短语。
1)one of the +最高级
Shanghai is one of the most beautiful cities in China.
Our city is one of the safest cities in the world.
Most people like apples.
Most of the boys are good.
It is our nearest neighbor in space.
2)最高级意义的表达方法:
例句
最高级 She is the best in her class.
比较级 She is better than any other student in her class.
No other student in her class is better than she.
原级 No other student in her class is as good as she.
(三)副词比较级和最高级的用法：
1. 原级主要的句型：
1)as+副词原级+as
Tom runs as fast as Jones.
not as/so+副词原级+as
He didn t come as/so early as Li Lei.
2)too+副词原级+to do sth.
Jean rides too slowly to catch up with me.
3)so +副词原级+ that
Jean rides so slowly that she can t catch up with me.
4)副词原级+enough to do sth.
Jean doesn t ride fast enough to catch up with me.
2. 比较级的用法：
1)比较级+than。当前后使用的动词相同时，通常用助动词来代替后面的动词，该动词或助动词可以省略。
Lily run faster than Mary(did).
2)比较级+and +比较级
The days are getting longer and longer in summer.
3)the more the more
The harder you work, the better you will learn.
3. 最高级的用法：
副词最高级前一般有the，也可省略。
He works (the) hardest of all the students in the class.
