It 作形式主语的四种结构
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It 作形式主语的四种结构
(1)It+be+形容词+that从句is necessary that.
有必要
It is important that
重要的是.
It is obvious that
很明显.
(2)It+be+done+that从句It is believed that
人们相信.
It is known to us/all that
众所周知
(3)It+be+名词+that从句
It is common knowledge that
是常识
It is a surprise that令人惊奇的是It is a fact that事实是
It is a pity that.... 遗憾的是.....
(4)It+不及物动词+that从句
It appears that
似乎
It happens that
碰巧