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主语从句

主语从句

在句子中担当主语的是一个句子,这个从句就叫作主语从句。主语从句可以由下列连词、连接代词和连接副词引导,且不能省略。

连词:that, whether 连接副词:when, where, how, why

连接代词:what, whatever, who, whoever 等

(1)由连词that, whether引导的主语从句

连词that, whether在从句中的作用只是引导主语从句,它在从句中不担任成分,不能省略,且由that, whether引导的主语从句,多用it 做形式主语

e.g ①That the earth is round is true.=It is true that the earth is round. 地球是圆的,是一个事实。

②Whether he’ll come or not hasn’t been decided.

= It hasn’t been decided whether he’ll come or not.

(2)由连接代词或连接副词引导的主语从句

连接代词who, which和连接副词when, where, how, why都可以引导主语从句,它们分别在从句中担任主语、宾语和状语,不能省略,翻译时,不能把它们译为疑问句,由它们引导的主语从句,也可以用形式主语it 引导

e.g ①Who let out the news remained unknown. =It remained unknown who let out the news.

谁泄漏了那个消息仍旧无人知道。

②When we’ll start is not clear. =It is not clear when we’ll start. 我们何时出发还不清楚。

(3)以关系代词what, whatever, whoever, whomever, whichever 引导的主语从句不能用形式主语it 引导,它们在句子中担任成分,不能省略,语序为陈述语序。

e.g ①What he said at the meeting is important. 他在会上所说的事情是重要的。

②Whoever leaves the office should tell me. 无论是谁离开办公室都应该告诉我。

(4)用it 作形式主语的主语从句结构

a. It is +名词+从句

①It is a fact that… 事实是…… ②It is good news that … ……是好消息 ③It is a question that … ……是个问题 ④It is common knowledge that ………是常识 类似的名词还有:a pity;a wonder;a good thing; no wonder; surprise 等

例如:①It is a mystery to me how it all happened. 这一切是怎么发生的是个谜。

②It is common knowledge that the whale is not a fish. 鲸鱼不是鱼,这是常识。

③It is no surprise that Bob should have won the game. 鲍勃会赢得这场比赛,这不足为奇。 b. It is +形容词+从句

①It is necessary that … 有必要……

②It is clear that … 很清楚…… ③It is likely that … 很可能……
④It is important that … 重要的是……

②It is clear that … 很清楚…… ③It is likely that … 很可能…… ④It is important that … 重要的是……

类似的形容词还有:strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. 例如:①It is obvious that conductors and insulators are both important in industry.

很明显导体和绝缘体在工业中都很重要。

②It is doubtful whether she will be able to come. 她是否能来令人怀疑。

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