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定语从句一、关系代词的用法1 ． that 和 which 的用法(1) 限制性定语从句中，必须用关系代词 that 的情况：① 当先行词是不定代词 all ， much ， little ， something ， everything ， anything ， nothing ， none ， the one 时。You should hand in all that you have.② 当先行词前面被 the only ， the very ， any ， few ， little ， no ， all 等词修饰时。This is the only thing that has been tried.③ 当先行词是形容词最高级或先行词的前面有形容词最高级修饰时。This is the best that has been used against pollution.④ 当先行词是序数词或它前面有序数词修饰时。This train is the last that will go to Suzhou.⑤ 当先行词既有人又有物时。Do you know the things and persons that they are talking about?⑥ 当主句的主语是疑问词 who 或 which时。Which is the bike that you lost?⑦ 有两个定语从句时，其中一个关系代词已用 which ，另外一个宜用 that 。They secretly built up a small factory ， which produced things that could cause pollution.⑧ 当先行词在主句中作表语，而关系代词也在从句中作表语时。Shanghai is no longer the city that it used to be. (2) 定语从句中必须用 which 的情况：① 在非限制性定语从句中，只用 which ，不用 that 。Helen was much kinder to her youngest son than to the others ， which ， of course ， made the others envy him.② 当动词短语中的介词提前时，只用 which ，不用 that 。This is a house in which Lu Xun once lived.注意：在一些固定搭配的动词短语中，由于动词和介词不可分割，因此不能把介词置于关系代词之前。This is the pen (which/that) I'm looking for.不可以说： This is the pen for which I'm looking.2 ． who ， whom 和 whose 的用法当先行词指人，在定语从句中作主语时，用 who ，不可省略；在定语从句中作宾语时，用 whom/that ，可以省略；在定语从句中作定语时，用 whose ，不可省略。She is the girl who lives next door.That's the girl (whom/that) I teach.3 ．“介词＋关系代词”引导的定语...