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1、谈定语从句中的关系代词可换与不可换请看下面这道选择题：I have told everything _ I know to you Awhat Bthat Cwhich Dwho 本题考查的是定语从句关系代词的用法。关系代词that，which和who引导定语从句时，在句中的职能和意义彼此相通：即which用来指物，who用来指人，that即可指物，也可指人。指物时，which和that有时可以互换；指人时，who和that有时可以互换，但在下列情况下却不能互换： 1如果定语从句所修饰的词是指物的不定代词时，用that不用which。故此，本题答案应选B（that），不选C（which）。也就
2、是说，在本题中，that与which不能互换。但是指人的不定代词用that或who皆可。例如： They will punish（惩罚）anybody thatwho cut down young trees 2当定语从句所修饰的词有限定的修饰词时，必须用which或who，不能用that。例如：（1）April 1st is the day which is called April Fools Day in the west (2) I know the detective who successfully saved the little boy in the accident 3当定语
3、从句所修饰的那个词是数词或所修饰的那个名词有一个数词作定语时，一般用that，不用which。例如：The two books that I bought yesterday are English novels 4在only，no，any，little，much，all之后，以及先行词带有最高级修饰语时，一般多用that不用which，但all指人时，用who不用that。例如： (1)This is the only book that we can borrow （2）That is the best film that I have seen so far （3）The book co
4、ntains muchlittle that is useful（4）All who know him like him very much （5）Say all that you know 5that不能像which，whom那样放在介词之后，而必须将介词调到句末。例如： （1）The man thatwho you talked with yesterday is my uncle或The man with whom you talked yesterday is my uncle （2）This is the cage in which Polly lives或This is the c
5、age thatwhich Polly lives in 6人和物并列作先行词时，在the same，the very，the last和序数词之后时，常用that，一般不用which或who。例如： （1）She was the firstthe last students that came this morning （2）He made a speech on the men and things that he had seen in Canada (3) Looking at the man and his donkey that are walking up the street
6、(4)This is the same pen that I lost yesterday （5）This is the very book that I have been looking for 7前面有who，which，what等疑问代词时，定语从句的关系代词应用that，不用who或which。例如：（1）Who is the man that is standing by the door？ （2）Who that has such a home does not love it？ （3）Which is the dog that you lost yesterday？ （4）What that you say does not interest him？ 8先行词为that，those指物时，关系代词用which。those指人时，关系代词用who，that皆可。例如：（1）Please show me that which you bought yesterday （2）That which you borrowed from me wasnt a real diamond necklace（3）They are those whothat we love
