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1、名词性从句Subjectclause主语从句Objectclause宾语从句Predicativeclause表语从句Oppositiveclause同位语从句作用相当于名词主语宾语表语同位语Thatshecouldcometohelpusmadeusveryhappy主语谓语宾语宾补Itisveryimportantthatastudent(should)learnEnglishwell.形主系表真正的主语定义：在复合句中做主语的从句叫主语从句主语从句的语序主语从句+谓语it（形式主语）+that（真正主语）2.Conjuncti
2、onsofNounClauses(引导主语从句的关联词):从属连词(不作成分）连接代词（作成分）连接副词（作状语）what,who,which,whom,whose,whateverthat,whether,（注意if不能引导）when,where,how,why如果一个句子在复合句中充当一个主语, 那么这个句子就是主语从句。①That he finished writing the composition in such a shorttimesurprisedus all.②What we needaregood doctors
3、.③Whom we must study forisa question of greatimportance.1.主语从句的连接词1).连接词: that, whether(不充当从句成分）①.Thathe will win is certain.②.Whetherhe'll join us in the discussion isimportant.用连接代词引导的主语从句 在由连接代词who, whose, whom, which, what, whoever,whomever, whichever, whatever引导的
4、名词性从句中，其连接代词在句中起名词性作用，担当一定成分.例如：Whatyou need is more practice.Whateverwe do is to serve the people.注：whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义。它引导主语从句，并在从句中作主语、宾语、表语等。whatever = anything that; whoever = anyone who。要注意和whatever, whoever引导的让步状语从句的区别。如：Whoeverbre
5、aks the law should be punished. （主语从句）＝Anyone who breaks the law should be punished.Whoeverbreaks the law, he should be punished. （让步状语从句）=No matter who breaks the law, he should bepunished. ）（3）用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。)例如:Wherewe should leav
6、e it is a problem.Whenwewillsetoffisstillunderdiscussion.it作形式主语的主语从句有时为了考虑句子平衡，通常在主语从句处使用形式主语it，而将真正的主语从句移至句末。这分四种情况(1) 对于以连词that引导的主语从句，通常用形式主语it替代主语从句： It is+名词+从句It is a fact that.....事实是It is good news that......是好消息It is a question that......是个问题It is common k
7、nowledge that......是常识It isa mystery to mehowit all happened.It iscommon knowledgethatthe whale is not a fish.It isno surprisethatBob should have won the game. It is+形容词+从句It is necessary that....有必要„„；It is clear that....很清楚„„；It is likely that....很可能„„；It is impor
8、tant that....重要的是„„It isdoubtfulwhether she will be able to come.It isessentialthat heshouldbe here by the weekend.It
