4)it +过去分词+从句
It is reported that...据报道……
It has been proved that...已证实……
3.主语从句不可位于句首的五种情况
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。如:
据说江主席下周要来我校视察。
It is said that President Jiang 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。如:
他考试没及格。
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。如:
他是不是错了,这一点不重要。
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。如:
傍晚有可能下雨吗?
Is it likely that it will rain in the evening? (right)
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