高中英语-主语从句精品课件(共17张PPT).ppt

1、His job is important.What he does is important.主语从句的定义：主语在句中充当主语的从句叫做主语从句。The subject clause主语从句主语从句+谓语主语从句的句序：it（形主）+that（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

2、 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 subject clauses in the following sentences,

3、and think about what are the connectors(连接词).主语从句的引导词：连词that,whether 连接代词 who(ever),whom(ever),which(ever),what(ever)连接副词 where,when,why,how What 与 that 引导主语从句规则：what引导名词性从句时在从句中充当句子成分,如主语,宾语,表语,而that则不然,它在句子中只起连接作用，但不能省略。(1)_you said yesterday is right.(2)_she is still alive is a great news to all

4、of us.WhatThat主语从句的规则：注意:由that 引导的主语从句有时为了使句子结构平衡,避免“头重脚轻”,常用 it 作形式主语,而把从句放在后面。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It is natural that they should like each other.It is impossible that he will refuse this piece of advi

5、ce.这样就构成了下面一些常用句型:1)It is+n.+从句 It is a pity/shame that.遗憾的是 It is a surprise that令人惊奇的是 It is a fact that 是事实 It is common knowledge that 是常识*_(很遗憾)we lost the match.*_(这是事实)he cheated in the exam.It is a pity thatIt is a fact that2)It is+adj.+从句 Its certain that 肯定 It is possible that.很可能 It is un

6、likely that.不可能 It is obvious that 很明显 It is necessary important natural.that*_(很可能)she will come back tomorrow.*_(很明显)this measure is effective.+(should)+doIt is possible thatIt is obvious that.It was not clear whether the solid shape would last or not.Subject ClauseSubjectFormed SubjectWhether the

7、 solid shape would last or not was not clear.Real引导主语从句在句首只能用whether,有it作形式主语的whether/if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

8、 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 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。）Consol

9、idation-学法指导依据“缺什么补什么”原则确定正确的连词。所谓“缺什么补什么”是指从句与连词之间的关系。如果句子中缺主语，指人用who，指物用what；如缺宾语，指人用whom，指物用what；如缺时间状语用when；地点状语用where；原因状语用why；方式状语用how；定语用what或which；什么都不缺用that。Wether表“是否”。1.用 that/whether/if/where/how/when/why/who/what/which/how much/etc.来连接主语从句.Summary:Subject Clause3.引导主语从句在句首只能用whether,有it

10、作形式主语的whether/if都可以.2.That 在主语从句中不能省略.4.有时为了使句子结构平衡,避免“头重脚轻”,常用 it 作形式主语,而把从句放在后面.4种句型。5.主语从句作主语时，谓语动词一般用单数形式。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,7）“what”引导主语从句时，谓语动词：常与其后的名词作表语一致，且根据句子的语境而定。eg：8).用于 It is important/natural/necessary/impossible that.句型中,主语从句应使用虚拟语气,用“should+动词原形”的形式,should有时可以省略。9).在 It+be+suggested/advised/ordered/requested/insisted/required 中,that从句的谓语也应该用“should+动词原形”的形式,should有时可以省略。Thank you!Good-bye!