主語從句精品課件

1、The subject clause 第1頁/共17頁 主語從句+謂語主語從句的句序： it（形主）+that（真主）第2頁/共17頁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 k

2、nown 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, and think about what are the connectors (連接詞) .第3頁/共17頁 主語

3、從句的引導(dǎo)詞： 連詞 that , whether 連接代詞 who(ever), whom(ever), which(ever), what(ever) 連接副詞 where ,when ,why ,how 第4頁/共17頁What 與 that 引導(dǎo)主語從句規(guī)則：what引導(dǎo)名詞性從句時在從句中充當(dāng)句子成分,如主語,賓語,表語,而that則不然,它在句子中只起連接作用，但不能省略。(1)_you said yesterday is right.(2) _she is still alive is a great news to all of us.WhatThat主語從句的規(guī)則：第5頁/共

4、17頁 注意: 由that 引導(dǎo)的主語從句有時為了使句子結(jié)構(gòu)平衡, 避免 “頭重腳輕”, 常用 it 作形式主語, 而把從句放在后面。 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.第

5、6頁/共17頁這樣就構(gòu)成了下面一些常用句型: 1) It is + n. +從句 It is a pity/shame that. 遺憾的是 It is a surprise that令人驚奇的是 It is a fact that 是事實 It is common knowledge that 是常識*_(很遺憾)we lost the match.*_(這是事實)he cheated in the exam.It is a pity thatIt is a fact that第7頁/共17頁2) It is + adj. +從句 Its certain that 肯定 It is poss

6、ible that. 很可能 It is unlikely that. 不可能 It is obvious that 很明顯 It is necessary important natural. that*_(很可能)she will come back tomorrow.*_(很明顯)this measure is effective.+(should) +doIt is possible thatIt is obvious that第8頁/共17頁.It was not clear whether the solid shape would last or not. Subject Cla

7、useSubjectFormed SubjectWhether the solid shape would last or not was 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第9頁/共17頁主語從句的規(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詞多用 單數(shù)第三人稱形式。第10頁/共17頁主語從句的規(guī)則：找出下列句子中的

8、錯誤，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 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.第11頁/共17頁主語從句的規(guī)則：1. What he needs is that book.2.

9、What he needs are some books.規(guī)則四:what 引導(dǎo)的主語從句，可根據(jù) 表語決定主句動詞的單復(fù)數(shù)形式。 （what 用法較特殊，需要記住。）第12頁/共17頁Consolidation -學(xué)法指導(dǎo)依據(jù)“缺什么補(bǔ)什么”原則確定正確的連詞。所謂“缺什么補(bǔ)什么”是指從句與連詞之間的關(guān)系。如果句子中缺主語，指人用who，指物用what；如缺賓語，指人用whom，指物用what；如缺時間狀語用when；地點(diǎn)狀語用where；原因狀語用why；方式狀語用how；定語用what或which；什么都不缺用that 。Wether表“是否” 。第13頁/共17頁1. 用用 that

10、/ whether / if/ /where / 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.有時為了使句子結(jié)構(gòu)平衡, 避免 “頭重腳輕”,常用 it 作形式主語,而把從句放在后面.4種句型。5.主語從句作主語時，謂語動詞一般用單數(shù)形式。第14頁/共17頁1. What you left are only several old books.2. What you said is of great importance.6）主語從句中用陳述語序,7）“what”引導(dǎo)主語從句時，謂語動詞： 常與其后的名詞作表語一致 ，且根據(jù)句子的語境而定。 eg：8) . 用于 It is important / natural / necessary / impossible that.句型中, 主語從句應(yīng)使用虛擬語氣, 用“should + 動詞原形”的形式, should有時可以省略。9) .