1、it做形式主语，that引导主语从句，that 不做句子成分，不能省略。

2、类似结构：1. it is +certain/exciting/surprising that+主句从句。

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3、It is certain that we will defeat the enemy. 毋容置疑，我们会击败敌人。

4、2. it is a pity/shame/pleasure that…It is a pity that we failed in the game. 遗憾地是我们输掉了比赛。

5、3. it is suggested/reported that.. It was suggested that everyone should buy an English dictionary. 有人建议，每个人都要买一本字典。

6、除此之外that还可以引导其它从句：1. that引导宾语从句，不做成分，可以省略。

7、I know that you are right. 2. that可以引导表语从句，不做成分，不能省略。

8、My aim is that I will make a teacher. 3. that可以引导同位语从句，不做成分，不能省略。

9、Word came that Trump will visit China. 消息传来，特朗普即将访问中国。

10、应该是that引导主语从句，it是形式主语。

11、it is amazing (that) the programme can put your email...这个程序能把你的电子邮件…。

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