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一、which可以做疑问代词和关系代词。 1. 用作疑问代词时，意思是"哪一个,哪一些" Which is my seat? 哪个座位是我的? 2. 用做关系代词时，意思是"那一个,那一些" He also had a gun with which to defend himself. 他还有一把自卫用的枪。 二、That可以做副词，代词，形容词和连词，但是做连词时是最常见的，也是最难鉴别的，that 用作连词，引导名词性从句,状语从句和强调句。 1. that在名词性从句中。 ①引导宾语从句。及物动词后的引导词that可省略。 I didn't expect (that) he could win the championship. The teacher pointed out that Tom was not working hard enough. ②引导主语从句。通常采用it作形式主语的句型。 That the earth goes around the sun is known to everyone. (It is known to everyone that the earth goes around the sun.) ③引导表语从句。 The trouble is that we are short of money. ④引导同位语从句。 引导同位语从句的that和引导定语从句的that是不同的。前者只起语法作用，在从句中不作任何成分;而后者在定语从句中作主语、宾语或表语。举例说明： | 
