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高中英语主语从句的用法
主语从句通常由下列词引导:
 
1)从属连词that,whether,if等;
 
2)连接代词what,who,which,whatever,whoever,whom 等;
 
3) 连接副词how,when,where,why 等。
 
that在句中无词义,只起连接作用;连接代词和连接副词都在句中既保留自己的疑问含义、又起连接作用,在从句中充当主语的成分。注:whom、who指人,what指物,whatever,whoever表示泛指意义。例如:
 
What he wants to tell us is not clear. 他要跟我们说什么,还不清楚。
 
Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。
 
It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。
 
Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行,还没有宣布。
 
有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下:
 
(1)It be+ 名词 + that从句
 
It's a great pity(that)they didn't get married.
 
他们没能结婚,真是令人惋惜。
 
It 's a good thing(that)you were insured.
 
你保了险,这可是件好事。
 
(2)It be + 形容词 + that从句
 
It's splendid that you passed your exam.
 
你通过考试了,真棒。
 
It's strange that there are no lights on.
 
真奇怪,没有一盏灯是开着的。
 
(3)It be + 动词的过去分词+ 主语从句
 
It's said that he has been there many times.
 
据说他去过那儿很多次。
 
(4)It + 不及物动词 + that 从句[1]
 
另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有:
 
It is necessary (important, natural, strange, etc.) that …
 
It is suggested (requested, proposed, desired, etc.) that…
 
(5) it seems/happens+that 从句
 
众所周知的几种表达方式
 
(1)It is known to us that.
 
(2)As is known to us.
 
(3)what is known to us is that.
 
it引导的强调句结构:It is/was+被强调部分+that/who+句子其它部分。
 
eg:My father did the experiment in the lab yesterday evening.
 
强调主语:It was my father who did the experiment in the lab yesterday evening.
 
强调宾语:It was the experiment my father did in the lab yesterday evening.
 
强调时间:It was yesterday evening that my father did the experiment in the lab.(注意不用when)
 
强调地点:It was in the lab that my father did the experiment yesterday evening.
 

高中英语主语从句的用法

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