主语从句有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下:
(1)It + be + 名词 + that从句
It’s a pity that you missed the film. 你没有看那部电影真是太遗憾了。
(2)It + be + 形容词 + that从句
It is important that a student learn English well. 学生学好英语很重要。
(3)It + be + 动词的过去分词 + that从句
It is said that he was killed in the earthquake. 据说他在地震中丧生了。
(4)It + 不及物动词 + that 从句
It seems that they will win the game. 看起来他们好像会赢得这场比赛。
另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有:
It is necessary (important, natural, strange, etc.) that …
It is a pity (a shame, no wonder, etc.) that…
It is suggested (requested, proposed, desired, etc.) that…
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