主语从句不可位于句首的五种情况
首先我们大家都明白在复合句子中起名词作用的句子叫名词性从句。简单把它理解成名词，但形式是一个句子。那主语从句就是在句中作主语，主语从句的位置与陈述句中主语位置相同的，统观主语从句的考核占有相当比重，下面和小编具体来看一下主语从句不可位于句首的五种情况吧！
(1) if 引导的主语从句不可居于复合句句首。
It is uncertain if he will leave for Beijing tomorrow.
(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 occurred to him that he failed in the examination. (right)
That he failed in the examination occurred to him. (wrong)
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如：
It doesn’t matter whether he is wrong or not. (right)
Whether he is wrong or not doesn’t matter. (wrong)
(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)
注：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.
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