as ,which的比较.ppt

定语从句
关系词
先行词所指
关系词在从句中作用
关系
代词
that
人 / 物
主语、宾语、表语
which
物
主语、宾语, 表语
who
人
主语、宾语
whom
人
宾
as 用于限制性定语从句中
关系代词as常用于
such+名词+as… 像……一样的；像……之类
the same+名词+as… 和……同样的
so+形容词+a/an+名词+as…
代表前面的先行词，在从句中充当主语或宾语等。
I had the same experience as you had.
Here is so heavy a box as can be lifted by nobody.
We have found such materials as are used in their factory.
Those houses are sold at such a low price as people expected.
He is not the same man as he was.
As 与 the same 连用, 引起定语从句
the same … as 表示同一类人或物；
the same … that 指同一个人或物
This is the same pen ______I lost yesterday.
A. as B. that
one D. A&B
D
比较：
...the same pen as I lost.
... the same pen that I lost.
表示这支笔与我不见的那支很像，不一定就是
则表示这支笔就是我不见的那支
Eg:
This is such an easy question as I can answer.
This is such an easy question that I can answer it.
as 和 which引导非限制性定语从句的区别
as的用法：①在从句中通常做主语代指整个主句，
②表示的意思是正如，正象
③其引导的定语从句即可以放在主句之前也可以放在主句之后也可放于主句中作插入语。
The Pacific is the largest ocean, as we all know.
正如我们所知到的，太平洋是最大的洋。（引导非限制性定语从句的as在从句中做know的宾语，其代指整个主句）
As was expected, we won the game.
正如(我们)预料的一样，我们赢了。（ 引导非限制性定语从句的as在从句中做主语，其代指整个主句。从句在主句的前面 ）
As is known to all, he is the best student in our class.
（引导非限制性定语从句的as在从句中做主语，其代指整个主句。）
which的用法：①关系代词，在从句中做主语或宾语，代指人或物。
②其引导的非限制性定语从句只能放在主句之后。
Tom suddenly fell ill, which made us sad.
He studied in that school, which was named after his grandfather.
as 在从句中作主语时，后面常接行为动词的被动语态，如 be known， be said，
be reported 等
★如从句中行为动词是主动语态，一般要用which作主语。
★
1) She has been late again, _______ was expected.
2) Tom has made great progress, _______ made us happy.
as
which
Exercise
1. ______ was natural, he married Jenny.
A. Which B. That
C. This D. As
2. Such signs _____ we use in the experiment
____