1、The subject clause His job is important.What he does is important.主语从句的定义：主语从句的定义：主语主语在句中充当主语的从句在句中充当主语的从句 主语从句。主语从句。1.主语从句主语从句+谓语谓语主语从句的句序：2.it（形主）（形主）+that（真主）（真主）1That he will come is certain.2Whether it will please them is not easy to say.3What seems easy to some people seems difficult to others
2、.4Which side will win is not clear.5Why he did it remains a mystery.6When they will start is not known yet.7How he became a great scientist is known to us all.8Who will take part in the meeting has not been decided.9Whoever breaks the law will be punished.10Where she is from is unknown.Find the subj
3、ect clauses in the following sentences,and think about what are the connectors(连接词连接词).主语从句的连接词：主语从句的连接词：连词连词 that,whether，if 连接代词连接代词 who(ever),whom(ever),which(ever),what(ever)连接副词连接副词 where,when,why,how I.连接词连接词 连词连词 that,whether，if(1)that 不充当任何成分，只起到连接作用，不充当任何成分，只起到连接作用，不能省略不能省略(2)whether/if不充当任
4、何成分，只起到连接不充当任何成分，只起到连接作用，表示作用，表示“是否是否”_ life exists on other planets is not clear yet.It is still doubtful _ she would play the role.Whether*放在句首的主语从句只能用放在句首的主语从句只能用whetherwhether/if 比较：比较：what&that 引导主语从句引导主语从句*what引导名词性从句时在从句中充当句子引导名词性从句时在从句中充当句子成分成分,如主语如主语,宾语宾语,表语表语;*that在句子中只起连接作用，但不能省略。在句子中只起连接
5、作用，但不能省略。(1)_you said yesterday is right.(2)_she is still alive is a great news to all of us.WhatThat 2.由由it 作形式主语的主语从句：作形式主语的主语从句：有时为了使句子结构平衡有时为了使句子结构平衡,避免避免“头重脚轻头重脚轻”,常常用用 it 作作形式主语形式主语,而把从句从句放在后面而把从句从句放在后面:1.That he will refuse this piece of advice is impossible._ 2.That they should like each oth
6、er is natural._It is natural that they should like It is impossible that he will refuse常用句型常用句型:1)It is+n.+从句从句 It is a pity/shame that.遗憾的是遗憾的是 It is a surprise that令人惊奇的是令人惊奇的是 It is a fact that 是事实是事实 It is common knowledge that 是常识是常识*_(很遗憾很遗憾)we lost the match.*_(这是事实这是事实)he cheated in the exam
7、.It is a pity thatIt is a fact that2)It is+adj.+从句从句 Its certain that 肯定肯定 It is possible that.很可能很可能 It is obvious that 很明显很明显 It is necessary important natural.that*_(很可能很可能)she will come back tomorrow.*_(很明显很明显)this measure is effective.+(should)+doIt is possible thatIt is obvious thatConsolidation 依“缺什么补什么缺什么补什么”原则确定正确的连词。所谓所谓“缺什么补什么缺什么补什么”是指是指从句从句与与连词连词之间的关系：之间的关系：如果句子中缺如果句子中缺主语主语，指人用，指人用who，指，指物物用用what；如缺如缺宾宾语，指语，指人人用用whom，指，指物物用用what；如缺如缺时间状语时间状语用用when；地点状语地点状语用用where；原因原因状语状语用用why；方式状语方式状语用用how；定语定语用用what或或which；什么都不缺什么都不缺用用that，Whether表表“是否是否”。
