名词性从句知识拓展
名词性从句知识拓展
Written by Zhang Yingchun
（一）名词性从句的定义
在复合句中起名词作用的从句叫名词性从句。这种从句在句中作宾语、主语、表语和同位语，分别称为宾语从句、主语从句、表语从句和同位语从句。名词性从句都要用陈述语序。
（二）引导名词性从句的连词
1. 引导四种名词性从句的连词基本相同：
1) 连词 that , whether
2) 连接代词 what , which , who (whom) , whose
3) 连接副词 when , where , why , how (how many , how much , how long , etc.)
2. 其它个别连词：
1) 也可以引导宾语从句和主语从句Whatever , whoever , whichever
2) 引导表语从句的连词还有because 和as if / as though
3. 连词使用注意事项：
1) 引导宾语从句时常常可以省略掉, 但引导其它三种从句时不能省略that
2) 引导宾语从句时whether常可换为if , 但引导其它三种从句只能用whether
3) 区别that和what ：that无意义，在名词性从句中不充当句子成分，只起连接
的作用。what有意义，在名词性从句中可作宾语、主语、表语。
A . that ： That he came late again made the teacher angry .
The trouble is that I have lost his address .
I hope that you can come to see me again .
The news that he was seriously injured made us surprised .
B . what ：What he said made the teacher angry .
My hometown is no longer what it was 15 years ago .
The police asked me what had happened then .
I have no idea what will happen next .
（三）主句和从句的时态搭配
1. 主句为一般现在时态 , 从句可以根据需要选择使用任何一种时态。
2. 主句为一般过去时态 , 从句则必须使用过去时态中的一种(客观真理除外)。
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