(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
(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
It appears that 似乎
(4) It + 过去分词 + 从句
It is reported that 据报道
It has been proved that 已证实
It is said that 据说
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。例如:
正确表达:It is said that President Jiang will visit our school next week.
错误表达:That President Jiang will visit our school next week is said.
(3)It happens/occurs结构中的主语从句不可提前。例如:
正确表达:It occurred to him that he failed in the examination.
错误表达:That he failed in the examination occurred to him.
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