高中英語-主語從句精品課件

1、 His job is important.What he does is important. 主語從句的定義：主語從句的定義：主語主語在句中充當(dāng)主語的從在句中充當(dāng)主語的從句叫做主語從句。句叫做主語從句。The subject clause 主語從句主語從句+謂語謂語主語從句的句序： 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 othe

2、rs.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 su

3、bject clauses in the following sentences, and think about what are the connectors (連接詞連接詞) . 主語從句的引導(dǎo)詞：主語從句的引導(dǎo)詞： 連詞連詞 that , whether 連接代詞連接代詞 who(ever), whom(ever), which(ever), what(ever) 連接副詞連接副詞 where ,when ,why ,how What 與與 that 引導(dǎo)主語從句引導(dǎo)主語從句規(guī)則：規(guī)則：what引導(dǎo)名詞性從句時(shí)在從句引導(dǎo)名詞性從句時(shí)在從句中中充當(dāng)句子成分充當(dāng)句子成分,如主語如主語,賓語

4、賓語,表語表語,而而that則不然則不然,它在句子中它在句子中只起連接作用，只起連接作用，但不能但不能省略省略。 _you said yesterday is right.(2) _she is still alive is a great news to all of us.WhatThat主語從句的規(guī)則： 注意注意: 由由that 引導(dǎo)的主語從句有時(shí)為了使句引導(dǎo)的主語從句有時(shí)為了使句子結(jié)構(gòu)平衡子結(jié)構(gòu)平衡, 避免避免 “頭重腳輕頭重腳輕”, 常用常用 it 作作形式形式主語主語, 而把從句放在后面。而把從句放在后面。 例如例如: 1. That he will refuse this pie

5、ce of advice is impossible._ _2.That they should like each other is natural. _*it為形式主語為形式主語It is natural that they should like each other.It is impossible that he will refuse this piece of advice.這樣就構(gòu)成了下面一些常用句型這樣就構(gòu)成了下面一些常用句型: 1) It is + n. +從句從句 It is a pity/shame that. 遺憾的是遺憾的是 It is a surprise tha

6、t令人驚奇的是令人驚奇的是 It is a fact that 是事實(shí)是事實(shí) It is common knowledge that 是常識(shí)是常識(shí)*_(很遺憾很遺憾)we lost the match.*_(這是事實(shí)這是事實(shí))he cheated in the exam.It is a pity thatIt is a fact that2) It is + adj. +從句從句 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 很明顯很明顯 It i

7、s necessary important natural. that*_(很可能很可能)she will come back tomorrow.*_(很明顯很明顯)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 solid shape would last or not was

8、 not clear.Real引導(dǎo)引導(dǎo)主語從句在主語從句在句首只能用句首只能用whether,有有it作形式主語的作形式主語的whether/if都可以都可以.Conclusion:ifIf主語從句的規(guī)則：例3. When he will come are a puzzle.正：When he will come is a puzzle.規(guī)則四:含主語從句的主句謂語動(dòng)詞多用 單數(shù)第三人稱形式。主語從句的規(guī)則：找出下列句子中的錯(cuò)誤，并總結(jié)規(guī)律例1.When will he come is not known.規(guī)則一:主語從句一律用陳述語序， 即主語在前，謂語在后。正：When he will c

9、ome 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.主語從句的規(guī)則：1. What he needs is that book.2. What he needs are some books.規(guī)則四:what 引導(dǎo)的主語從句，可根據(jù) 表語決定主句動(dòng)詞的單復(fù)數(shù)形式。 （what 用法較特殊，需要記住。）Consolidati

10、on -學(xué)法指導(dǎo)依據(jù)“缺什么補(bǔ)什么缺什么補(bǔ)什么”原則確定正確的連詞。所謂所謂“缺什么補(bǔ)什么缺什么補(bǔ)什么”是指是指從從句句與與連詞連詞之間的關(guān)系。如果句子中缺之間的關(guān)系。如果句子中缺主語主語，指人用，指人用who，指，指物物用用what；如；如缺缺賓賓語，指語，指人人用用whom，指，指物物用用what；如缺如缺時(shí)間狀語時(shí)間狀語用用when；地點(diǎn)狀語地點(diǎn)狀語用用where；原因狀語原因狀語用用why；方式狀語方式狀語用用how；定語定語用用what或或which；什么什么都不缺都不缺用用that 。Wether表表“是否是否” 。 用用 that / whether / if/ /where /

11、 how / when /why / who /what/which/ how much / etc. 來連接主語從句來連接主語從句.Summary:Subject Clause3.引導(dǎo)主語從句在引導(dǎo)主語從句在句首只能用句首只能用whether,有有it作形式主語的作形式主語的whether/if都可以都可以.2.That 在主語從句中在主語從句中不能省略不能省略.4.有時(shí)為了使句子有時(shí)為了使句子結(jié)構(gòu)平衡結(jié)構(gòu)平衡, 避免避免 “頭重腳頭重腳輕輕”,常用常用 it 作形式主語作形式主語,而把從句放在后而把從句放在后面面.4種句型。種句型。5.主語從句作主語時(shí)，謂語動(dòng)詞一般用主語從句作主語時(shí)，謂語

12、動(dòng)詞一般用單數(shù)單數(shù)形式。形式。 What you left are only several old books. What you said is of great importance.6）主語從句中用陳述語序）主語從句中用陳述語序,7）“what”引導(dǎo)主語從句時(shí)，謂語動(dòng)詞：引導(dǎo)主語從句時(shí)，謂語動(dòng)詞： 常與其后的名詞作表語一致常與其后的名詞作表語一致 ，且根據(jù)句子的語境而定。，且根據(jù)句子的語境而定。 eg：8) . 用于用于 It is important / natural / necessary / impossible that.句型中句型中, 主語從句應(yīng)使用虛擬語氣主語從句應(yīng)使用虛擬語氣, 用用“should + 動(dòng)詞動(dòng)詞原形原形”的形式