在句子中起名词作用的句子叫名词性从句(Noun Clauses)。名词性从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。
引导名词性从句的连接词可分为三类:
连接词:that, whether, if (不充当从句的任何成分)
连接代词:what, whatever, who, whoever, whom, whose, which
连接副词:when, where, how, why
不可省略的连词:
1. 介词后的连词
2. 引导主语从句和同位语从句的连词不可省略
That she was chosen made us very happy.
We heard the news that our team had won.
【比较】whether与if均为“是否的意思。但在下列情况下,whether不能被if取代:
1. whether引导主语从句并在句首
2. 引导表语从句
3. whether从句作介词宾语
4. 从句后有"or not",例:Whether he will come or not is not clear.
大部分连接词引导的主语从句都可以置于句末,用it充当形式主语:
It is not important who will go.
It is still unknown which team will win the match.
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