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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. | 
