is not easy to say. 3)连接副词when，where， how， why等。 Why he did it remains a mystery.

　　2.位置： 主语从句可以前置，也可以后置。用it做形式主语，而把主语从句，在句末，常用下面几种句型。 1）It + be + 表语

　　+主语从句 表语：（名词， 形容词，过去分词） 2）It+不及物动词+主语从句 It seemed (happened, doesn’t matter, has turned out) that…

　　It is still uncertain whether he is coming or not. It happens that they were absent. It is a fact (a shame, a pity, good news…) that… 3) It +及物动词（被动语态）+主语从句 It has been decided that the exhibition will not open on Sundays. 注意: 1）主语从句在句首时，必须由连接词引导，不能省略这些连接词；但是如果用it做形式主语，而把主语从句放在句末时，从属连词that可以省略。 误：They should like each other is natural. 正：That they should like each other is

　　natural. 正：It is natural that they should like

　　each other. 2)如果主语从句放在句首，不能用if引导，但是如果用it 做形式主语，而把主语从句放在句末时，也可以用if引导. 误：If Mary really heard him is really doubtful. 正：It was doubtful if Mary really heard him. 1.I have always been honest and straightforward, and it doesn‘t matter ______that I’m talking to.

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