比较级& 最高级
同级比较
1.as...as 和...一样A+be/系+as+adj. +as Chinese is as important as Maths.
2.not as...as 不如A+be/系+not+as+adj. +as
The desk is not as expensive as the computer. = The desk is cheaper(less expensive) than the computer.
* A + do(didn’t/ doesn’t/don’t do sth) as + adv + as B
比较级和最高级的形成
* 一般单音节词和少数以-er，-ow结尾的双音节词，比较级在后面加-er，最高级在后面加-est；
eg. small→smaller→smallest short→shorter→shortest
* 以不发音e结尾的单音节词，比较在原级后加-r，最高级在原级后加-st
rge→larger→largest nice→nicer→nicest able→abler→ablest
* 在重读闭音节（即：辅音＋元音＋辅音）中，先双写末尾的辅音字母，比较级加-er，最高级加-est；eg. big→bigger→biggest hot→hotter→hottest fat→fatter→fattest
* 以“辅音字母＋y”结尾的双音节词，把y改为i，比较级加-er，最高级加-est
eg. easy→easier→easiest heavy→heavier→heaviest busy→busier→busiest happy→happier→happiest * 其他双音节词和多音节词，比较级在前面加more，最高级在前面加most；
eg. beautiful→more beautiful→most beautiful easily→more easily→most easily
* 有少数形容词、副词的比较级和最高级是不规则的
eg. good/well→better→best bad→worse→worst ill→worse→worst many/much→more→most little→less→least far →further/farther→ furthest/farthest
注意：（1）形容词最高级前通常必须用定冠词 the，副词最高级前可不用。
The Sahara is the biggest desert in the world.
（2）形容词most前面没有the，不表示最高级的含义，只表示"非常"。
It is a most important problem. =It is a very important problem.
形容词比较级
* 形容词比较级句型：主语+动词+形容词比较级+than+比较对象
* 原型前+very/ too/ so/ quite 比较级前+much/ even/ get/ a little...
I feel much better now. I feel even worse.
* 只可同类比较My house is bigger than yours (your house)
* 比较级and 比较级，越来越....
They are getting richer and richer. Our city is getting more and more beautiful.
* of the two 用“the+比较级”表示两者中最...
It’s the cheaper of the two.
* the +比较级，the+比较级越...就越...
The more careful you are, the better you will be.
* 在比较级中，通常用that代替上文中提到的单数/不可数，复数用those
The water in this cup is less than that in that cup.
* Who/ Which is ....，A or B 用比较级
Who is slimmer, Marry or Millie?
形容词最高级
形容词最高级句型：主语+动词+the+形容词最高级+of+比较对象（in+比较范围）
* 用于三者及以上of the three / in our class
He is the tallest boy of the three / in our class.
* 最高级前+ the，副词前不加the
She is the best of the three. She sings best of the three.
* one of the + 最高级+ n. (复数）最...之一
She is one of my best friends.
* the+序数词+形容词最高级+n. (单数） ...是...的第几
The Yellow River is the second longest river in China.
* 比较级和最高级的转化
He is the tallest boy in his class. = He is taller than any other boy in his class. = He is taller than all the other boys in his class.
* any 和any other
Yangtze River is longer than any other river in China.
Yangtze River is longer than any river in America.
副词比较级句型：动词+副词比较级+than+比较对象
副词最高级句型：动词+副词最高级+of+比较对象（in+比较范围）
