主语从句精品课件PPT课件下载推荐.ppt

1、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.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

2、 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 subject clauses in the following sentences,and think about what are the connectors（连接接词）.主语从句的引导词：主语从句的引导词：连词连词 that,whether 连接代词连接代词 who（ever）,wh

3、om（ever）,which（ever）,what（ever）连接副词连接副词 where,when,why,how What 与与 that 引导主语从句引导主语从句规则：规则：what引导名词性从句时在从句引导名词性从句时在从句中中充当句子成分充当句子成分,如主语如主语,宾语宾语,表语表语,而而that则不然则不然,它在句子中它在句子中只起连接作只起连接作用，但不能用，但不能省略省略。（1）_you said yesterday is right.（2）_she is still alive is a great news to all of us.WhatThat主语从句的规则：注意注意

4、:由由that 引导的主语从句有时为了使句引导的主语从句有时为了使句子结构平衡子结构平衡,避免避免“头重脚轻头重脚轻”,常用常用 it 作作形式形式主语主语,而把从句放在后面。而把从句放在后面。例如例如:1.That he will refuse this piece of advice is impossible._ _2.That they should like each other is natural._*it为形式主语为形式主语It is natural that they should like each other.It is impossible that he will r

5、efuse this piece of advice.这样就构成了下面一些常用句型这样就构成了下面一些常用句型: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.It is a pity thatIt is a fact that2）It

6、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 unlikely that.不可能不可能 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 that.It was not clear whethe

7、r the solid shape would last or not.Subject ClauseSubjectFormed SubjectWhether the solid shape would last or not was not clear.Real引导引导主语从句在主语从句在句首只能用句首只能用whether,有有it作形式主语的作形式主语的whether/if都可以都可以.Conclusion:ifIf主语从句的规则：例3.When he will come are a puzzle.正：When he will come is a puzzle.规则四:含主语从句的主句谓语动

8、词多用 单数第三人称形式。主语从句的规则：找出下列句子中的错误，并总结规律例1.When will he come is not known.规则一:主语从句一律用陈述语序，即主语在前，谓语在后。正：When he will come is not known.2.Where will he go is not yet fixed.正：Where he will go is not yet fixed.3.Why was Lily late is not important.正：Why Lily was late is not important.主语从句的规则：1.What he needs

9、 is that book.2.What he needs are some books.规则四:what 引导的主语从句，可根据 表语决定主句动词的单复数形式。（what 用法较特殊，需要记住。）Consolidation-学法指导依据“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”是指是指从从句句与与连词连词之间的关系。如果句子中缺之间的关系。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；如缺缺宾宾语，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；原因状

10、语原因状语用用why；方式状语方式状语用用how；定语定语用用what或或which；什么都什么都不缺不缺用用that。Wether表表“是否是否”。1.用用 that/whether/if/where/how/when/why/who/what/which/how much/etc.来连接主语从句来连接主语从句.Summary:Subject Clause3.引导主语从句在引导主语从句在句首只能用句首只能用whether,有有it作形式主语的作形式主语的whether/if都可以都可以.2.That 在主语从句中在主语从句中不能省略不能省略.4.有时为了使句子有时为了使句子结构平衡结构平衡,

11、避免避免“头重脚头重脚轻轻”,常用常用 it 作形式主语作形式主语,而把从句放在后面而把从句放在后面.4种句型。种句型。5.主语从句作主语时，谓语动词一般用主语从句作主语时，谓语动词一般用单数单数形式。形式。1.What you left are only several old books.2.What you said is of great importance.6）主语从句中用陈述语序）主语从句中用陈述语序,7）“what”引导主语从句时，谓语动词：引导主语从句时，谓语动词：常与其后的名词作表语一致常与其后的名词作表语一致 ，且根据句子的语境而定。，且根据句子的语境而定。eg：8）.用于用于 It is important/natural/necessary/impossible that.句型中句型中,主语从句应使用虚拟语气主语从句应使用虚拟语气,用用“should+动词动词原形原形”的形式的形式,should有时可以省略。有时可以省略。9）.在在 It+be+suggested/advised/ordered/requested/insisted/required 中中,that从句的谓语也应该用从句的谓语也应该用“should+动词原形动词原形”的形式的形式,should有时可以省略。Thank you!Good-bye!