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That which代表物，区别听我来叙述; 先行若是不定代，that就把which 踹; 当先行词为anything，everything，nothing，all，any，much，many，one等不定代词时，只能使用“that”, 不用 “which”。 例：Is there anything that I can do for you? 我能给你做点什么吗? 先行词前有两数， 就用that定无误; 当先行词是基数词或序数词修饰时，只能使用“that”，不用 “which”。 例句： That is the second time that I have been to Japan. 那是我去日本的第二次。 The two buildings that lay on the River Thames fell down last week. 坐落在泰晤士河岸边的那两座大楼上星期倒塌了。 先行词前最高级， 还用that必无疑; 当先行词是形容词最高级或被形容词最高级修饰时，只能使用“that”, 不用 “which”。 例句：This is the most wonderful time that I have ever had. 这是我度过的最美好的时光。 句中若有there be, that应把which替; 例：There is no evidence that animals possess a mysterious sixth-sense allowing them to predict natural disasters. 说动物拥有神秘的第六感，可以预知自然灾害，这是没有根据的。 先行主中做表语， 避免重复从句里; | 
