全力直擊英語語法：定語從句

2 、關(guān)系副詞引導(dǎo)的定語從句

關(guān)系副詞可代替的先行詞是時間、地點(diǎn)、方式或理由的名詞，在從句中作狀語。

關(guān)系副詞when, where, why, how的含義相當(dāng)于"介詞+ which"結(jié)構(gòu)，因此常常和"介詞+ which"結(jié)構(gòu)交替使用，例如：

There are occasions when (on which) one must yield.　

Beijing is the place where (in which) I was born.　　

Is this the reason why (for which) he refused our offer?　

I‘m surprised the way how (by which) he works out the problem.

注意

①在非限制性定語從句中，"介詞+ which"結(jié)構(gòu)不能代替關(guān)系副詞。

如：They set up a state for their own , where they would be free to keep Negroes as slaves.

②含有介詞短語的動詞一般不能拆開，介詞仍放在動詞后面。

Is this the book which (that) she was looking for?

3、名詞/數(shù)詞/代詞 /形容詞最高級 + 介詞 + 關(guān)系代詞引導(dǎo)定語從句

She has written a book , the name of which I have forgotten.

There are fifty-five students in our class , all of whom are working hard.

There are five continents in the world , the largest of which is Asia.

4、as, which 引導(dǎo)非限定性定語從句的差別

由as, which 引導(dǎo)的非限定性定語從句，as和which可代整個主句，相當(dāng)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可引導(dǎo)非限制性從句，常帶有“正如”的意思。

As is know, smoking is harmful to one‘s health.

用法區(qū)別

(1) as 引導(dǎo)的定語從句可置于句首，而which不可。

As we all know, he never smokes.

(2) as 代表前面的整個主句并在從句中作主語時，從句中的謂語必須是系動詞；若為行為動詞，則從句中的關(guān)系代詞只能用which。

(3)非限定性定語從句中出現(xiàn)expect, think, suppose 等表示猜測、想象、預(yù)料等時。

She succeeded in her doing the research work , as we expected.

(4)As 的用法 the same… as; such…as 中的as 是一種固定結(jié)構(gòu), 和……一樣……。

I should like to use the same tool as is used here.

We should have such a dictionary as he is using.