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英語(yǔ)定語(yǔ)從句簡(jiǎn)單總結(jié)
定語(yǔ)從句在句中做定語(yǔ)，修飾一個(gè)名詞或代詞，有時(shí)也可以修飾部分或整個(gè)句子。
被修飾的名詞，詞組或代詞即先行詞。定語(yǔ)從句通常出現(xiàn)在先行詞之后，由關(guān)系詞(關(guān)系代詞或關(guān)系副詞)引出。
關(guān)系代詞有：who, whom, whose, that, which, as。
關(guān)系副詞有：when, where, why, how。
關(guān)系代詞和關(guān)系副詞放在先行詞和定語(yǔ)從句之間，起連接作用，同時(shí)又可做定語(yǔ)從句的一個(gè)成分。當(dāng)關(guān)系代詞做賓語(yǔ)時(shí)可以省略。
定語(yǔ)從句中的謂語(yǔ)動(dòng)詞必須在人稱上和數(shù)量上和先行詞保持一致。
定語(yǔ)從句分為限制性定語(yǔ)從句和非限制性定語(yǔ)從句。
關(guān)系代詞引導(dǎo)的定語(yǔ)從句
1) who, whom, that 這些詞代替的先行詞是人的名詞或代詞，在從句中所起作用如下：
Is he the man who/that wants to see you?(who/that在從句中作主語(yǔ))
He is the man whom/ that I saw yesterday.(whom/that在從句中作賓語(yǔ))
2) whose 用來(lái)指人或物，(只用作定語(yǔ)，若指物，它還可以同of which互換).
例如：Please pass me the book whose (of which) cover is green.
3) which, that 它們所代替的先行詞是事物的名詞或代詞，在從句中可作主語(yǔ)、賓語(yǔ)等.
例如：A prosperity which / that had never been seen before appears in the countryside.(which / that在句中作賓語(yǔ))
The package (which / that) you are carrying is about to come unwrapped.(which / that在句中作賓語(yǔ))
關(guān)系代詞that和which 都可以指物，that 和Who 都可以指人，其用法區(qū)別：
不用that的情況：
a) 在引導(dǎo)非限定性定語(yǔ)從句時(shí)
(錯(cuò))The tree, that is four hundred years old, is very famous here.
b) 介詞后不能用
We depend on the land from which we get our food.
c) 多用who 的情況
①關(guān)系代詞在從句中做主語(yǔ)
A friend who helps you in time of need is a real friend.
②先行詞為those, people 時(shí)
Those who were either fools or unfit for their offices could not see the cloth.
③先行詞為all, anyone, ones, one 指人時(shí)
One who doesn't work hard will never succeed in his work.
④在There be句型中There is a stranger who wants to see you.
⑤在被分隔的定語(yǔ)從句中
A new teacher will come tomorrow who will teach you German.
⑥在有兩個(gè)定語(yǔ)從句的句子中，其一用who，其二用that,但若先行詞后接兩個(gè)以上的并列定語(yǔ)從句時(shí)，后一個(gè)必須重復(fù)前一個(gè)關(guān)系代詞。
The student who was praised at the meeting is the monitor that is very modest and studies very hard.
There is a teacher who is always ready to help others and who enjoys what he does.
只能用that作為定語(yǔ)從句的`關(guān)系代詞的情況
a)在不定代詞，如：anything, nothing, everything, all, much, few, any, little等作先行詞時(shí)，只用that，不用which。
All that is needed is a supply of oil.
Finally, the thief handed everything that he had stolen to the police.
b)先行詞有the only, the very, the just修飾時(shí)，只用that。
He is the very man that helped the girl out of the water.
c)先行詞為序數(shù)詞(the last)、數(shù)詞、形容詞最高級(jí)時(shí)，只用that。
The first English book that I read was "The Prince and the Pauper" by Mark Twin.
d)先行詞既有人，又有物時(shí)。
He talked about the teachers and schools that he visited.
e)當(dāng)主句是以who 或which 開(kāi)始的特殊疑問(wèn)句時(shí)，用that 以避免重復(fù)。
Who is the person that is standing at the gate.
f)關(guān)系代詞在從句中做表語(yǔ)
He is not the man that he used to be.
關(guān)系副詞引導(dǎo)的定語(yǔ)從句
關(guān)系副詞可代替的先行詞是時(shí)間、地點(diǎn)、方式或理由的名詞，在從句中作狀語(yǔ)。
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(yǔ)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(yǔ)的動(dòng)詞一般不能拆開(kāi)，介詞仍放在動(dòng)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(jí) + 介詞 + 關(guān)系代詞引導(dǎo)定語(yǔ)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.
④as, which 引導(dǎo)非限定性定語(yǔ)從句的差別
由as, which 引導(dǎo)的非限定性定語(yǔ)從句，as和which可代整個(gè)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(yǔ)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(gè)主句并在從句中作主語(yǔ)時(shí)，從句中的謂語(yǔ)必須是系動(dòng)詞;若為行為動(dòng)詞，則從句中的關(guān)系代詞只能用which。
(3)非限定性定語(yǔ)從句中出現(xiàn)expect, think, suppose 等表示猜測(cè)、想象、預(yù)料等時(shí)。
She succeeded in her doing the research work , as we expected.
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