一、概述
形容词修饰名词，说明人或事物或特征。在句中可作定语、表语、宾语补足语。
The beautiful girl is Tom’s sister.（充当定语）
Three is nothing serious, is there?（充当定语，修饰不定代词的形容词及短语要放在不定代词之后）
The shoes in the shop were not very expensive.（作表语）
The old are looked after well.（有些形容词和定冠词the连用时，表示一类人或物，其谓语动词用复数形式）
二、形容词比较级及最高级的形式
1、绝大部分双音节形容词和单音节形容词的比较等级变化是规则变化。
| 情 况 | 变 化 形 式 | 举 例 |
| 一般情况 | 在词尾直接加-er ; -est | small – smaller – smallest |
| 以e结尾的词 | 在词尾加 –r ; – st ; | large – larger – largest |
| 以辅音字母+y结尾 | 变y为i，加- er; -est | happy- happier- happiest |
| 以一个元音字母加一个辅音字母结尾，而且是重读闭音节 | 将该辅音字母双写，再加 -er ; -est | fat – fatter – fattest thin – thinner – thinnest big – bigger – biggest hot – hotter – hottest |
2、部分双音节和多音节形容词比较级和最高级变化形式在多音节形容词前加more或most
beautiful – more beautiful – most beautiful
useful – more useful – most useful
3、不规则形容词比较级和最高级形式：
good, well – better – best bad, ill – worse – worst
many, much – more – most little – less – least
far – farther, further – farthest, furthest
三、形容词的比较等级的用法
1、当A=B时，则用as（副）…as（介，连）…，中间用形容词或副词的原级。表示甲与乙在某方面一样
He is as tall as I (me)
2、A≠B，则用not as(so)…as… 表示甲与乙在某方面不一样。
He is not so tall as I = He is shorter than I =I’m taller than he
The boy isn’t as careful as that one
= This boy isn’t as careful than that one
3、比较级+than 形式
This lesson is more difficult than that one
She is fatter than Kate
4、the+最高级+(in of)短语
Miss Zhou is one of the most popular in our class
He is the oldest of the three
of 常与名词复数或表示数量的词连用。表示“在…之中”这一。in常与表示范围或场所的名词连用“在…范围之中”
四、形容词比较级特殊用法
1）more and more比较级连用表示“越来越……”
In spring the weather gets warmer and warmer.
He is getting busier and busier.
2）The more … the more 越…就越…
The larger the bus is , the more people it can carry.
The farther away an object is from us, the smaller it looks.
3）比较级形式表达最高级：
比较级+than any other+名词单数；
比较级+than the other+名词复数
He is clever than any other boy
—- He is the clevest of all the boys
—- He is clever than the other boys
4、修饰比较级的副词有much, even , quite , a little, a lot等表示“得多”“甚至”，表示程度。
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