n 　　很多同学可能都会觉得在使用定语从句的时候，有时不知该选择that还是which作为引导词。以下是小编给大家整理的定语从句中的that和which用法，希望可以帮到大家

n 　　首先，that和which在从句里都可以做宾语和主语，做宾语时可以省略。在定语从句中,有种说法叫"关宾省",意思是关系代词在限制性定语从句中作宾语可以省略,不管是that，which，还是whom。但是which能引导非限制性定语从句，that则不行。

n 　　其次，记得以下只能用that的几种情况：

n 　　1. 当先行词为all, much, little, none及由any, every, some, no所构成的复合不定代词时。

n 　　如：We should do all that is useful to the people. 我们应该做一切有益于人民的事情。

n 　　Please tell me anything that you know about the matter. 有关此事，凡是你所知道的请告诉我。

n 　　2. 当先行词被any, few, little, no, all, much, some等词修饰时。

n 　　如：You can take any seat that is free. 任何空着的座位你都可以坐。

n 　　There is little work that is fit for you. 几乎没有适合你的工作。

n 　　3. 当先行词为序数词或被序数词所修饰时。

n 　　如：When people talk about the cities of China, the first that comes to my mind is Beijing. 人们谈论起中国的城市的时候，我首先 想到的是北京。

n 　　This is the fourth film that has been shown in our school this term. 这是我们校本学期放映的第四部电影。

n 　　4. 当先行词为形容词最高级或被形容词最高级修饰时。

n 　　如：The best that I could do was to apologize. 我唯一能做的就是赔礼道歉了。

n 　　This is the most interesting story book that I have ever read. 这是我读过的一本最有趣的故事书。

n 　　5. 当先行词被the very, the only, the last, the just, the same等修饰时。

n 　　如： This is the very book that I'm looking for. 这正是我在找的书。

n 　　The only thing that we could do was to wait. 我们唯一能做的事就是等待。

n 　　注意：先行词被the same修饰时，关系代词也可用as。

n 　　如：I need the same book that / as you have. 我需要有你一样的书。

n 　　6. 当先行词既包含人又包含物时。

n 　　如： They are talking of the heroines and their deeds that interest them. 他们正在谈论他们感兴趣的女英雄及她们的事迹。

n 　　7. 当先行词是疑问代词who，which，what或主句以这些词开头时。

n 　　如：Who that has ever worked together with him doesn't admire him? 曾经和他一起工作过的谁不钦佩他?

n 　　Which is the star that is nearer to the earth? 哪个是离地球比较近的星星?

n 　　8. 当先行词为主句表语或关系代词为从句表语时。

n 　　如：That's a good book that will help you a lot. 那是本对你很有帮助的书。

n 　　Our school is no longer the place that it used to be. 我们的学校现在已不是过去的那个样子了。

n 　　9. 先行词为time时，当time表示次数，引导词用that, 可省略。 当表示时间，可用that或when引导，都可省略。

n 　　如：I do remember the first time(that) I had ever heard the sweetest voice in the world.我很清楚地记得当我第一次听到世界上最美的声音的时候。

n 　　I did't remember the exact time (when/that) I arrived in Shanghai last month. 我不记得上个月到达上海的确切时间了。

n 　　最后，请注意以下几种只能使用which的情况:

n 　　1. 在“介词+关系代词”结构中，关系代词必须用which。

n 　　如： The house in which we live is very large. 我们住的房子非常大。

n 　　This is the reference book of which the teacher is speaking. 这就是老师正在谈及的那本参考书。

n 　　注意： 如果介词不放在修饰事物的限定性定语从句的句首， which就可换为that， 例如： This is the question which/that we've had so much discussion about. =This is the question about which we've had so much discussion. 这就是我们已经多次讨论过的问题。

n 　　2. 先行词为“those+表事物的复数名词”时， 关系代词通常只用which而不用that。

n 　　如：you should grasp well those skills which may be used in the future work.

n 　　最后，记得这个特殊情况吧：当先行词是表示原因或方式的名词时，可以用that引导定语从句，相当于介词+which，that可以省略。

n 　　如： She likes the child for the very reason that (=for which) she loves his father. 她喜欢那个孩子因为她爱着孩子的父亲。

n 　　He didn't like the way that (=in which) she speaks to his mother. 他不喜欢她对他的母亲那样说话。

n 　　Imagine the speed that (=at which) he drives the car. 很难想象，他开车开得那么快。

n 　　The reason (that /for which /why) he came here was to ask for our help.他来这里的原因是寻求我们的帮助。