
名词性从句是在句子中起名词作用的句子。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。
1、主语从句:
What he wants to tell us is not clear. 他要跟我们说什么,还不清楚。
It's a great pity that they didn't get married. 他们没能结婚,真是令人惋惜。
2、宾语从句:
He has told me that he will go to Shanghai tomorrow. 他已经告诉我他明天要去上海。
I insist that she (should) do her work alone. 我坚持要她自己工作。
3、表语从句:
The fact is that we have lost the game. 事实是我们已经输了这场比赛。
It looks as if it is going to rain. 看上去天要下雨了。
4、同位语从句:
The news that we won the game is exciting. 我们赢得这场比赛的消息令人激动。
I have no idea when he will come back home. 我不知道他什么时候回来。
注意:同位语从句和定语从句的区别:
that作为关系代词,可以引导定语从句,充当句子成分,在从句中作宾语时可以省略; that引导同位语从句时,起连词的作用,没有实际意义,不充当句子成分,一般不能省略。
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