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三.比较When/which、wher /which、why.

which I still never forget.

This is the day when I joined the party.

which he spent reading the books.

wher I found the book.

which makes machines.

This is the place which we once visited.

which I will never forget.

which I am looking for.

限制性定语从句与非限制性定语从句的区别：

限制性定语从句

非限制性定语从句

All the students who study hard have passed.学习努力的学生都考试及格了。(只有努力的及格了，不努力的没及格。) All the students ,who study hard have passed.所有的学生都及格了，他们学习努力。(没有人不及格，这些学生都很努力。)

从句是先行词不可缺少的定语(如去掉，主句意思就不完整或不正确。) 从句是对先行词的附加说明(如去掉，主句意思仍清楚，不受影响。) 与主句关系密切，不用逗号 与主句关系不十分密切，用逗号与主句隔开译为汉语时，从句译在先行词前，与先行词用“的”连接 译为汉语时，从句放在主句后面关系代词that可以代替who、whom(指人)、which(指物) 关系代词不用that,只用who、whom(指人)、which(指物) 关系代词代替宾语时可以省略 关系代词不能省略关系代词as和which

先研究下面两个例句：

○1.This elephant is like a snake, as /which everybody can see. =As everybody can see, this elephant is like a snake. 任何人都看得出来，这头象像条蛇。

○2.Tom didn’t pass the physics exam, which made his parents very angry. Tom物理考试不及格，这使得他父亲很生气。

这两个例句中，as和which所代表的都是整个主句所表示的内容。但有两点不同之处：

1. 在形式上as引导的非限制性定语从句可位于主句的后面，也可位于主句的前面;而which引导的非限制性定语从句只能位于主句的后面，不能位于主句的前面。

2. 在意义上，as引导的定语从句和主句的关系一般为一致关系，常译为“正如……”，“就像……”，而which引导的定语从句和主句的关系是因果关系，或which引导的定语从句是对主句的评论。因此，在意思通顺的情况下，which可代替as，而as许多时候不能代替which，如句○2。再如：

1.He was late again, as / which we had expected. =As we had expected, he was late again. 正如我们所料，他又迟到了。/他又迟到了这是我们早就料到的。

2. The street hasn’t been cleared for weeks, which makes it very dirty. 街道好多星期没有打扫了，因此整条街很脏。(不用as)

3.The young man cheated his friend of much money, which was disgraceful. 那年轻人诈骗了他朋友许多钱财，这是不光彩的。(不 用as)

4.He takes exercise everyday, which has done a lot of good to his health. 他每天运动，这对他的身体很有好处。(不用as)

5.As has already been pointed out, English is rather difficult for a foreigner. 正如已经指出的那样，英语对于初学者说，是相当难学的。在such…as…、the same…as…、 as…、 as many…/much as…等结构中,as不能用which代替。如：

1.Such books as this are too difficult for beginners. 这样的书对于初学的人来说是太难了。

=Books such as this are …

=Books like this are …

2.I live in the same building as he (does). 我和他住再同一座大楼里。

3.He knows as many people as are present at the meeting. 他认识所有到会的人。

4.That day we all got up early as usual. 那天我们和平时一样，都起得很早。

“One of the +复数名词”后面定语从句中谓语单复数情况

这一结构后面的定语从句的谓语动词通常用复数形式，跟定语从句所*近的那个复数名词在数上保持一致。如：

1. That is one of the books that are required for study at school.

2. This is one of the most wonderful novels that have been published since 1990.

3. She is one of the few persons who know Spanish .

4. This is one of the most famous plays that were written in the thirties,

如果one of +复数名词这一结构前面带有the only、the very之类的限定语，后面定语从句的谓语动词则要用单数形式，这是因为定语从句在意义上修饰的是而不是那个复数名词。如：

1.He is the only one of the teachers who knows French in our school.( 修饰the only one)

He is one of the teachers who know French in our school.( 修饰the teachers)

2.This is the only one of the rooms that is free now. (修饰the only one)

This is one of the rooms that are free now. (修饰rooms)

as与which引导的定语从句

两者均可引导非限制性定语从句，有时可以互换，但下列情况多用as。

1. 关系代词引导的定语从句居句首时。 As we all know, the earth is round.

2. 当与such或the same连用时，一般用as。 Such books as you tell me are interesting. I have the same plan as you.

3. 当从句和主句语义一致时，用as，反之则用which。 She has married again, as was expected. She has married again, which was unexpected.

4. 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。

She has been late again, as was expected.

Tom has made great progress, which m

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