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1、 高考圈-让你的大学对得起高三主语从句1.定义主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语 it 代替，而本身放在句子末尾。 2.It 作形式主语和 it 引导强调句的比较 It 作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it 引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用 who/whom。例如： It is in the morning that the murder took place. It is John that broke the window. 3.用 it
2、 作形式主语的结构 (1) It is 名词从句 It is a fact that 事实是 It is an honor that 非常荣幸 It is common knowledge that 是常识 高考圈-让你的大学对得起高三(2) it is 形容词从句 It is natural that 很自然 It is strange that 奇怪的是 (3) it is 不及物动词从句 It seems that 似乎 It happened that 碰巧 (4) it 过去分词从句 It is reported that 据报道 It has been proved that 已
3、证实 4.主语从句不可位于句首的五种情况 高考圈-让你的大学对得起高三(1) if 引导的主语从句不可居于复合句句首。 (2) It is said , (reported) 结构中的主语从句不可提前。例如： It is said that President Jingo will visit our school next week. (right) That President Jiang will visit our school next week is said. (wrong) (3) It happens, It occurs 结构中的主语从句不可提前。例如： It occur
4、red to him that he failed in the examination. (right) That he failed in the examination occurred to him. (wrong) (4) It doesnt matter how/whether 结构中的主语从句不可提前。例如： It doesnt matter whether he is wrong or not. (right) Whether he is wrong or not doesnt matter. (wrong) 高考圈-让你的大学对得起高三(5) 含主语从句的复合句是疑问句时，主语从句不可提前。例如： Is it likely that it will rain in the evening? (right) Is that will rain in the evening likely? (wrong) 5.What 引导主语从句时在句时在从句中充当句子成分，如主语宾语表语，而 that 则不然。例如： 1) What you said yesterday is right. 2) That she is still alive is a consolation.
