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主语从句、表语从句、宾语从句和同位语从句都属于名词性从句范畴。引导这些从句的连词大体上相同,但是部分学生对其中某些连词之间的区别还不甚清楚。此外连词之间的差异也一直是各类英语试题的命题热点。本文就这些易错易混的连词谈谈它们的用法区别。 一、that,what和which 1. that引导名词性从句时只起连接从句的作用,本身没有任何意义,因此在从句中不充当任何句子成分,它的使用须注意以下几点: A. 引导宾语从句时,that常可省略,但如果主句后跟有并列宾语从句时,只能省略第一个that;若宾语从句前插有别的从句时,that也不能省略。例如: He told me (that) he was all right and that he would come to see me when he was free. 他告诉我说他很好,并说在他有空时来看我。 B. that引导主语从句位于句首时不可省略.如果it作形式主语,而that从句置于句末, 这时that可以省略。例如: That he has lost his work is not true. 他丢了工作不是真的。 =It is not true (that) he has lost his work. C.当主语为the reason时,注意应用that 引导其表语从句,不能受汉语影响而误用because。例如: The reason why he was late was that he missed the early bus. 他迟到的原因是他没赶上早班车.(此句中的that不可用because代替) | 
