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

答：英语中，as用作关系代词，承接前示或后续的从句之内容，它的意思是：这一事实、那一情况等。它常用作句子的主语、宾语等成分。它可以置于句首，也可以置于句中。例如：
As is known to us all, Taiwan is part of China. 众所周知，台湾是中国（神圣领土不可分割）的一部分。
The man was a teacher, as was evident from his way of speaking. 由那个男人说话的样子可明显看出，他是个老师。

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.

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vGjxytWcgE，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：搜趣网英//www.souquanme.com [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, he studies very hard. 

而要是换成which的话www.souquanme.com：

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 搜趣网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。