it做形式主语的句型

　　1、It + be + 名词 + that从句：It is a fact that 事实是。

　　It is an honour that 非常荣幸。

　　It is common knowledge that …是常识。

　　It is a pity that 遗憾…… 。

　　2、It + be + 动词的过去分词+ that从句。

　　It is said that 据说。

　　It is reported that 据报道。

　　It has been proved that 已经证明。

　　It is believed that … 人们认。

　　It is supposed that… 据猜测，

　　3、It + 不及物动词（vi） + that 从句。

　　It seems that 似乎。

　　It happened that 碰巧。

　　It appears that 似乎。

　　4、It is natural that… 很自然…。

　　It is strange that… 奇怪的是… 。

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