as + 形容詞或副詞原級(jí) + as
1)在否定句或疑問(wèn)句中可用so… as。
He cannot run so/as fast as you.
2)當(dāng)as… as 中間有名詞時(shí)采用以下格式。
as +形容詞+ a +單數(shù)名詞
as + many/much +名詞
This is as good an example as the other is.
I can carry as much paper as you can..
3)用表示倍數(shù)的詞或其它程度副詞做修飾語(yǔ)時(shí)，放在as的前面。
This room is twice as big as that one.
Your room is the same size as mine.
4) 倍數(shù)+ as + adj. + as <=> 倍數(shù)+ then + of
This bridge is three times as long as that one.
This bridge is three times the length of that one.
Your room is twice as large as mine.
Your room is twice the size of mine.
the + 級(jí) + 比較范圍
1) The Sahara is the biggest desert in the world.
形容詞級(jí)前通常必須用定冠詞 the，副詞級(jí)前可不用。
形容詞most前面沒(méi)有the，不表示級(jí)的含義，只表示"非常"。
It is a most important problem. =It is a very important problem.
注意： 使用級(jí)要注意將主語(yǔ)包括在比較范圍內(nèi)。
(錯(cuò))Tom is the tallest of his three brothers.
(對(duì))Tom is the tallest of the three brothers.
2) 下列詞可修飾級(jí)，by far, far, much, mostly, almost
This hat is nearly/almost the biggest.
注意： a. very可修飾級(jí)，但位置與much不同。
This is the very best.
This is much the best.
b. 序數(shù)詞通常只修飾級(jí)。
Africa is the second largest continent.
3) 句型轉(zhuǎn)換：
Mike is the most intelligent in his class.
Mike is more intelligent than any other students in his class.
4) "否定詞語(yǔ)+比較級(jí)"，"否定詞語(yǔ)+ so… as"結(jié)構(gòu)表示級(jí)含義。
Nothing is so easy as this.=Nothing is easier than this.
=This is the easiest thing.