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...

　　It’s a pity that you should have to leave.

　　你非走不可真是件憾事。

　　7.注意区分it作形式主语和it引导强调句：

　　it作形式主语代替主语从句，主要是为了平衡句子结构，主语

　　从句的连接词没有变化。而it引导的强调句则是对句子某一部

　　分进行强调，强调句句型It is/was＋被强调部分＋that，去掉

　　It is/was，that，句子仍然成立。无论强调的是什么成分，都

　　可用连词that。被强调部分指人时也可用who/whom。例如：

　　It is a pity that you didn’t go to see the film.(主语从句) It doesn’t interest me whether you succeed or not.(主语从句) It is natural that they should have different views.(主语从句) It is in the morning that the murder took place.(强调句) It is John that /who broke the window.(强调句) It is only lately that he has had a family himself.(强调句) What was it that he wanted？I don’t know what it was that he wanted.(强调句) It was in the hotel where he stayed that we discussed the serious problem.(强调句) 8．注意it作形式主语的主语从句和as引导非限制性定语从句的不

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