比较级与最高级1.as...as 与(not) as(so)...asas...as...句型中，as的词性第一个as是副词，用在形容词和副词的原级前，常译为“同样地”。
第二个as是连词，连接与前面句子结构相同的一个句子(相同部分常省略)，可译为“同.....He is as tall as his brother is (tall) . (后面的as 为连词)只有在否定句中，第一个as才可换为so改错: He is so tall as his brother.（X）2.在比较状语从句中，主句和从句的句式结构一般是相同的与as...as 句式中第二个as一样，than 也是连词。
as和than这两个连词后面的从句的结构与前面的句子大部分情况下结构是相同的，相同部分可以省略。
He picked more apples than she did.完整的表达为:He picked more apples than she picked apples.后而的picked apples和前面相同，用did 替代。
He walked as slowly as she did.完整表达为:He walked as slowly as she walked slowly.she后面walked slowly与前面相同，用did替代。
3.谓语的替代在as和than 引导的比较状语从句中，由于句式同前面主句相同，为避免重复，常把主句中出现而从句中又出现的动词用do的适当形式来代替。
John speaks German as fluently as Mary does.4.前后的比较对象应一致不管后面连词是than 还是as,前后的比较对象应一致。
The weather of Beijing is colder than Guangzhou. x than前面比较对象是“天气”，than 后面比较对象是“广州”，不能相比较。
应改为:The weather of Bejing is colder than that of Guangzhou.再如: His handwriting is as good as me.应改为: His handwriting is as good as mine.5.可以修饰比较级的词常用来修饰比较级的词或短语有:Much,even,far,a little,a lot,a bit,byfar,rather,any,still,a great deal等。
by far的用法:用于强调，意为“...得多”“最最...”“显然”等，可修饰形容词或副词的比较级和最高级，通常置于其后，但是若比较级或最高级前有冠词，则可置于其前或其后。
It's quicker by far to go by train.She ran fastest by far.He's by far the cleverer student,He is by far the best teacher,=He is the best teacher by far.6. more、 much与比较级more放在多音节形容词和副词前构成比较级，如:more interesting, more exciting. Much 修饰比较级。
如:much more interesting, much taller.而像much more taller/more taller是错误的。
7.比较级的否定形式表示最高级的意思有时比较级用于否定句时，可以表达最高级的意思。
Boris has brains. In fact, I doubt whether anyonein the class has a higher IQ.8. not +比较级与no +比较级no和比较级连用时，常表示它所修饰形容词或副词的相反的意思。
He is no taller than him.他比他高不到哪儿去。
( 他和他一样矮)My English is no better than yours.我的英语比你的好不到哪儿去。
(一样差)9.less 也可构成比较级（劣等比较）She is less rich than her younger sister.10.暗中比较与不用比较级改错: Our world is getting small and small.改为Our world is getting smaller and smaller.在这里，是指比原来更小，所以用比较级。
改错: A: I'm sorry I'm late.B: That's OK. But come early next time.11.在比较级中用to而不用than的几个词某些以-ior结尾的形容词进行比较时，用to代替than.这些词有inferior (劣等的，次的)、superior (较好的，优....... 、junior (资历较浅的)、senior (资格较老的)、prior ( ...之前)等。
He is superior to Mr. Zhang in chemistry.12.the+比较级(两者时)表达“两者中较....那一个”常用the+比较级。
常用于下列语境中:The taller boy is my brother.He is the taller of the two boys.13.同类异质比较:He is more hard-working than clever.“与其说，不如说”同类异质比较:即指同一个人或事物(同类)在两个不同的方面(异质)进行比较，这类句子常译为“是.....而不是””与其说....不如说......”等。
He was more lucky than clever。
She was more surprised than angry.按英语习惯，在进行同类异质比较时，只能用more构成比较级，不能用er形式，即使是单音节词也是如此。
14. the more, the morethe用在形容词或副词的比较级前，more 代表形容词或副词的比较级。
A.“the more... the more..."是复合句句型常表示“越...就越....，其中前面的句子是状语从句，后面的句子是主句。
主从句的时态常用一般现在时或一般过去时。
The higher the ground is, the thinner air becomes. The harder he worked,the more he got.B.若主句的谓语动词用一般将来时，从句的谓语动词要用一般现在时表示将来The harder you work, the greater progress you will make.The longer the war lasts, the more the people there will suffer.15.比较级+and+比较级此句型表示“越来越....”.. 单音节形容词或副词用“-er+and+-er”，多音节形容词和副词常用“more and more+形容词或副词”。
Things are getting better and better every day.It's becoming more and more difficult to find a job.Holiday flight tickets are getting less and less expensive.形容词最高级前的the一般不能省略，而副词最高级前的the可以省略16.least也可用来构成最高级He is the most careless boy in our class.He is the least careful boy in our class.17.the second longest在英语中，“最....”用最高级，“第二最....第三最....”.等等，也要用最高级。
The Changiang River is the third longest river in the world.18.形容词最高级前不用定冠词the 时，不表最高级，而表示“非常”He is a most clever young policeman. (most=very )他是一个非常聪明的年轻警察。
19.形容词最高级前省略the的情况一般来说，形容词最高级前要加定冠词"the".Li Ming is the tallest student in our class.但例外也有:A.形容词最高级作表语，用于同一个人或同一个物在不同情况下进行比较，而不与别的人或事物相比时这种情况形容词最高级前不用"the"; 但如果它后面接上名词，即使作表语，"the” 也不能省略。
I am busiest on Monday.我周一最忙。
(该句是把“我”在不同时候忙的程度相比较，并没有跟别的人相比较) The pool is deepest in summer.这个池塘夏天水最深。
(把同一池塘在不同季节的水深相比较，并没有与其他池塘相比较)B.形容词最高级前若有形容词性物主代词、指示代词或名词所有格修饰，则不能再加theThat's her best dress.The girl wants this biggest apple.Disney's greatest wish was to become a famous artist.C.在as, though引导的倒装让步状语中，形容词最高级前不用theYoungest as he was, he got the first prize.尽管他年龄最小，他得了一等奖。
D.当两个形容词最高级修饰一个名词时，后一个最高级前面的the通常省略This is the largest and finest building in Shanghai.E. 形容词最高级作宾语补足语时常省略“the"I think it best to go over it again and again. John found it most difficult to learn Chinese.20.比较范围的介词: of 与inin, of 两者都可以用在最高级的句子里表示比较范围。
of 后接复数名词或代词，句子主语和of后的名词是同类相比，即人与人比较、物与物比较。