as …… as 后面加动词原形。
语法：
1.as …… as结构多用于肯定式，偶尔也可用于否定式。表示同样意思的否定式多用so...as。as...as结构用于否定句时多用于口语，侧重“像…一样”；so...as结构则多用于书面语，侧重“像…那样”。
2.as...as结构表示的是同级比较，第一个as后的形容词或副词不可用比较级，必须用原级，比较的对象亦须属同类。
3.as...as结构表示数量或程度时，可用于“as much+(不可数名词+) as”或“as many+(可数名词复数+) as”结构。
4.修饰as...as结构的常见词语有nearly,almost,just,exactly,half,quite,表示倍数或次数的形容词，“数词+times”等。这些修饰语都放在as...as结构之前。
5.使用as...as结构时，若第一个as后的名词是单数可数名词并有形容词修饰，则应使用“as+ adj.+ a/an+ n. ”结构，即不定冠词应位于形容词和名词之间。第二个as后面的名词或代词的格不同，意思也不同。
6.as...as结构中后一个as用作连词时引导的从句常为省略句，省略从句中的动词可使主句的意义得到加强；反之，重复从句中的动词则可使从句的意义得到强调。
扩展资料
近义词：because、since
一、because英 [bɪˈkəz] 美 [bɪˈkəz]
conj.因为
例句：
He is called Mitch, because his name is Mitchell
二、since英 [sɪns] 美 [sɪns]
prep.自…以后;从…以来;(表示气愤)何曾，什么时候
conj.从…以后;自…以来;因为;由于;既然
adv.自…以后;从…以来;此后;后来
例句：
I'm forever on a diet, since I put on weight easily
我永远都在减肥，因为我很容易长胖。
第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如：
(1)This film is as interesting as that one.这部电影和那部电影一样有趣。
(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。
2.as …… as 后面加一个句子，通常为省略句。
I‘m as tall as he/him.
Tom ran as fast as she/ her.追问
拜托。。。虽然你回答得很好。。。但是我想问的是后面加动词什么形式。。。
追答1.接过去分词。It is as simple as told.
2.接doing。 Saying isn't as difficult as doing。
3.接 to do。 To say isn't as difficult as to do.
4.通常接省略句。
I‘m as tall as he/him.
Tom ran as fast as she/ her.
不专业。。。能不能写一下在什么情况下加doing、to do、或者过去分词
追答.as …… as 后面加一个句子，通常为省略句，
省略后，剩下的可能是doing、to do、或者过去分词
1.接过去分词。It is as simple as （it is）told.
2.接doing。 Saying isn't as difficult as doing（is difficult）。
3.接 to do。 To say isn't as difficult as to do(is difficult).
4.通常接省略句。
I‘m as tall as he(is tall).
1 The son studies as hard as his mother（主语） did（谓语） when she was a college student 25 years ago.（状语）。
2 She is as tall as I am.
3 Come as soon as you can. ===Come as soon as possible.