1. This is the same story as I heard yesterday.
2. He is honest, as we can see.
3. He really can’t lend you the money，as you might not realize．
4. Air, as we know, is a gas.
5.This is the same wallet as I lost.

Things will turn out contrary to one’s wishes, as is often the case
.Whales are now fish, as some people think / but some people think they are.
As we all know, he studies very hard

一、as引导限制性定语从句 主要结构有：the same…as as…as such…as so…as 主句中出现the same,as,such,so修饰先行词,需选择as做关系代词在定语从句中做主语或宾语.1.It’s the same person as we wanted to find yesterday .我们昨天要找的是同一个人.2.Such girls as he knows are good at English .他所认识的女孩都擅长英语.3.Do you have such books as we like 你有我们喜欢那种书吗?4.She will marry as healthy a man as she can find .她将嫁给她能找到的任何一个有钱人.5.There is so warm a house as we want to live in .这里有如此暖和的房子,我们都想住在里面.6.He has so difficult a problem ,as none of us can solve .他有如此难的一个问题,我们没有人能解决.二、引导非限制性定语从句 ⑴ as引导非限制性定语从句,指代整个主句内容,从句可置于句首,句中或句尾 1． As everyone knows ,China is a beautiful country with a long history .每个人都知道,中国是一个有着悠久历史的美丽国家.2． The earth ,as we know ,moves round the sun .地球,我们都知道,围着太阳转.3． Tom works hard and is willing to help others,as we all know.汤母工作努力,并且乐于助人,这一点我们都知道.⑵ 非限制性定语从句中的谓语为被动式时,常用as做主语 be said/known/announced/reported/mentioned/expected/discussed 1.Grammar ,as has been said before,is not a set of dead rules.语法,就像以前所说,不是一套死规则.2.As is known to all ,TaiWan is part of China .⑶ as引导非限制性定语从句,有“如,似,正像”的含义,因此,下列句式多用as as has been said above 如上所说 as anybody can see 正像每个搜趣网人所看到的那样 as we had expected 正如我们所预料的那样 1.Things are not always as they appear.事情并不一直像他们表面那样.2.The boy has as much progress as we had expected.正像我们所预料的那样,这个男孩取得了大的进步.由as,which 引导的非限定性定语从句,as和which可代整个主句,相当于and this或and that.As一般放在句首,which在句中.As we know,smoking is harmful to one';s health.The sun heats the earth,which is very important to us.as 和which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语.但不同之处主要有两点：(1） as 引导的定语从句可置于句首,而which不可.(2） as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词；若为行为动词,则从句中的关系代词只能用which

1. as...as引导定语从句时,第一个as还是程度副词,意思就是“同样,相同”.
第二个as为定语从句的关系代词,类似于which/that/who等,代指其前面的名词/代词,并在定语从句中充当主语、宾语、表语等.
所以楼主发现as在定语从句中充当主语,那是经常出现的情况,不足为奇.
比如：As many children as came were given some cakes.
第二个as,代替先行词children,在后面的定语从句中充当主语.
再如：He is as diligent a man as ever lived.
同样,第二个as代指前面的先行词a man,做ever lived的主语.
2. I give him as much as h搜趣网e could eat.
也通常理解为定语从句,much为代词,相当于much food.
第二个as代替much (food),在定语从句搜趣网中充当eat的宾语.
3. We've got food for as many people as want it.
翻译：我们弄到了无论多少人吃都够了的食物.
第一个as还是“一样地”,第二个as代指people,做want it的主语.
4. She will marry as healthy a man as she can find.
还是引导定语从句.
第一个as依旧是程度副词“一样地”（用法上类似于so）,修饰形容词healthy,表示程度.
如果对你有所帮助,请点击我回答下面的“选为满意回答”按钮,谢谢!

1、as用作关系代词和关系副词引导限制性定语从句，并在从句中作主语、宾语、状语或表语，构成the same。

2、as多与such 或the same连用，可以代替先行词是人或物的名词。

3、as 也可单独使用，引导非限制性定语从句，作用相当于which。

4、as引导的非限制性定语从句位置较灵活，可以位于主句前面。中间或后面，一般用逗号与主句隔开，但which所引导的非限制性定语从句只能放在主句之后。

as

读音：英 [æz , əz]   美 [æz , əz] 

释义：像，如同。

语法：as用作副词时主要用来表示比较，意思是“像…一样，如同”。可以单独使用，但更多的是用在as...as结构中，其中第一个as是副词，其后可接形容词或副词，也可接其他成分，as前可有状语。

扩展资料：

使用时的注意事项：

一、关系代词which和as在引导非限制性定语从句时是有区别的。它们的区别就是是：which引导的非限制性定语从句，绝不能放在句首，而as则可以。

例如：

He studies very hard, as we all know.  

也可说：

As we all know, h搜趣网e studies very hard. 

而要是换成which的话：

He studies very hard, which we all know.  在句中时，as有“正如”“就像”之意，而which则没有此意。

二、which引导非限制性定语从句作从句里面的介词宾语时，介词可以提到which前面。

例句：

Eric received training in computer for one year, after which he found a job in a big company.

as引导非限制性定语从句作从句里面的宾语时，不能把介词提到as前面的。