It is important that a student learn English well.

　　It’s clear that they badly need help.

　　It is likely that a hurricane will arrive soon.

　　需要注意的是，这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟语气。

　　It is +过去分词+从句 It is said that … 据说…… It is reported that … 据报道…… It has been proved that … 已证明…… It must be proved that… 必须指出…… 类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc. 例如：It is thought that he is the best player.

　　It is estimated that the vase is 2000 years old.

　　It is used to be thought that a new star must be due to a collision between two stars.

　　It has not been made clear when the new road is to be opened to traffic.

　　It is said that he was killed in the earthquake.

　　It seems （happened / appears / doesn’t matter / makes no difference / occurred …）that …如：

　　It seems that they will win the game.

　　It makes no difference whether he will attend the meeting or not.

　　It does not matter if I missed my train. It happened that I saw him yesterday.

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