主语从句和主语从句的it.ppt
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1、The Subject Clause,Grammar,Make sentences,Its certain that we will be late.,That well be late is certain.,We dont know whether he is coming or not,Whether he is coming is not known.,We dont know what he wants to tell us.,What he wants to tell us is not known.,When you will come back doesnt matter.,I
2、t doesnt matter when you will come back.,主语从句(Noun Clauses as the Subject),连接词有: 连词that, whether; 连接代词who, what和which; 连接副词when, where, how和why。,连接词:,that 引导主语从句只起引导作用,本身无实际意义,在主语从句中不充当任何成分,但不能省略。,That she left him cut him to the heart. That he will come is certain.,1)从属连词:that, whether等.,由whether及其
3、他连词引导的主语从句放在句首,句后都可。,Whether it will please them is not easy to say.,2)连接代词who ,what ,which, whatever, whichever, whoever,What seems easy to some people seems difficult to others. Which side will win is not clear.,3)连接副词when,where, how, why等。,Why he did it remains a mystery. When they will start is
4、not known yet. How he became a great scientist is known to us all.,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),位置,It is said that Mr. Green has arrived in Beijing. It is reported that China has sent another manmade earth satellite into orbit.,2. It+不及物动词+主语从句
5、 It seemed (happened, doesnt matter, has turned out) that,It happens that they were absent. It seems that Alice is not coming to the party at all.,It doesnt matter whether she will come or not.,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
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