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英语语法:名词性从句的用法 |
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什么是名词性从句的用法?
在复合句中起名词作用的从句叫名词性从句,包括主语从句、表语从句、宾语从句和同位语从句。
名词性从句的用法:
主语从句
主语从句就是在复合句中作主语的从句。
1.主语从句常用 that,whether,who,whom,whose,what,which,when,where, how,why,whatever,whoever 等引导。如:
Whether he will be able to come remains a question.
他是否来还是问题。
That China is a great socialist country is well known.
众所周知,中国是一个伟大的社会主义国家。
【注】为避免头重脚轻,使句子平衡,常用it作形式主语,而将主语从句后置。如:
It is well known that Terry is one of the best English teachers of our college.
众所周知,Terry是我们学院最好的英语老师之一。
但是,由连接代詞 what,whatever ( = no matter what), whoever ( = no matter who)等引导的主语从句一般不能用形式主语。
如:
What he found surprised me greatly.
他的发现使我非常吃惊。
Whoever is finished may rest.
凡是做完工的人都可以休息。
【注】that引导的主语从句,that在句中不作任何成分,但绝不能賓去。what引导的主语从句,在句中必须作成分(作主语或宾语),绝对不能省去。总而言之,引导主语从句时that不作成分,what必须作成分,都不能省去。
如:
That the moon moves round the earth is well known to all of us.
我们都知道,月亮绕着地球转。(that不作成分)
What I did is all for you.
我所做的一切都是为了你好。(what作宾语)
What impressed us most was that they never lost heart.
对我们印象最深的是,他们总不放弃。(what作主语)
2. if引导主语从句时,只能用it作形式主语uf549cv,放在句首,而将if引导的主语从 句放到句末。
如:
It is uncertain if he will leave for Beijing tomorrow.
明天他是否去北京还不敢肯定。
3.主语从句中主句的谓语动词一般用第三人称单数形式,反意疑问句用it来代替主语从句,但what引导主语从句的主句谓语动词的形式须根据句子的意思来 判断。如:
How he worked it out is still a secret,isn't it?
他是如何把它做出来的还是一个秘密,不是吗?
What they makes in this factory are TV sets.
他们在工厂里所做的东西就是电视机。更多资讯参考官网:http://www.shsunnyu.com/(尚语国际语言村) |
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