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that, what和which1. 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)
D.引导同位语从句时,切不可错用which。例如:
Word has come that some American guests will come to visit our school next week. 有消息说下周将有一些美国客人来我校参观。
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