1、 原级（同级）比较：as…as…; not as(so)…as…
We’ll give you as much help as we can.
She isn’t as(so)active in sports as before.
2. 比较级：表示两者之间比…… 更……可用状语much, a little, even等修饰 He made fewer mistakes than I did.
He is even richer than I.
3、 高级：形容词最高级前必须加the, 副词最高级前常省略the，后面多用of……， in……短语表示范围：
It was the most/least interesting story I have ever listened.
He is the tallest of the three.
4、 如果在两者之间表示“最……”时要在比较级前加the，而且还用of the two, of the pair短语：
John is the clever of the two boys.
Of the two boys, John is the clever.
You’re a boy as good as Tom.=You’re as good a boy as Tom.
2、 (1)too…to与 so…that sb.can’t…的句型转换：前者为简单句，主语只有一个，而后者为复合句，主语有两个，试比较：
The man was too angry to be able to speak.
The man was so angry that he wasn’t able to speak.
(2) too…to…与 not enough to句型的转换：
The book is too difficult for me to read.=
The book is not easy enough for me to read.
John is not so stupid as Mike.
John is less stupid than Mike.
John is cleverer than Mike.
John is taller than any other boy in the class.
John is the tallest boy in the class.
John is taller than any other boy.
5、 the more….. the more….表示“越……越……”:
The more books you read, the wider your knowledge is.
The more food you eat, the fatter you are.
6、 more and more….表示“越来……越……”:
More and more students realized the importance of a foreign language. Our country is getting stronger and stronger.
1. She is ________ than ________ .
A. busier / us B. busier / we
C. more busy / us D. more busy / we
2. Jane is ________ than Betty.
A. less taller B. less tallest
C. less tall D. not as tall
3. China is ________ country in the world.
A. the third largest B. the largest third
C. the third large D. a third largest
4、 -Which is ____ season in Beijing? --I think it's autumn.
C.best D.the best
5、 - Which is__________ , the sun, the moon or the earth?-- Of course, the moon is.
C.smallest D.the smallest
6.The air in Beijing is getting much _____ now than a few years ago.
A. clean B. cleaner
C. cleanest D. the cleanest
7. Mobile phones are very popular now and they are _____ than before.
A. cheap B. cheaper
C. cheapest D. the cheapest
8．I study English as_______as my brother.
A.hard B. harder
9. Which is _____ , a bicycle or a computer?
A.expensive B.more expensive
C.the most expensive
10. The Yellow River is one of ______rivers in China.
C the longest