主语从句课件

1、Subject Clauses 主语从句主语从句1. 主语从句：从句在句中充当主语成分主语从句：从句在句中充当主语成分1). That he will succeed is certain .2)Whether he will go there is not known .3) How we can help the twins will be discussed at the meeting. 1 引导主语从句的连接词有三类：引导主语从句的连接词有三类：(1) 连词连词that、 whether ：Whether we go by train or by boat makes no diff

2、erence.Whether hell come here isnt clear. That price will go up is certain.What she did is not yet known.Who will write the poem has not been decided yet.Whatever he did is right.(2)连接代词连接代词who, whom, whose, what, which, whoever, whatever, whichever等等3) 连接副词连接副词 where, when, how, why等。等。How this hap

3、pened is not clear to anyone. When he will be back depends on the weather.How the pyramids were built is still a mystery.主语从句后置主语从句后置! 为了避免主语冗长免主语冗长,句子头重脚轻句子头重脚轻,经常用经常用it作作形式主语形式主语,主语从句放在后面作真正的主语主语从句放在后面作真正的主语. 例:That we shall be late is certain.- Its certain that we shall be late.1. That the earth

4、is round is known to all.- 2. That you missed the chance is a pity.- It is a pity that you missed the chance.Its known to all that the earth is round.A. It+be+形容词形容词(obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.)+that从句。如：Itiscertainthatshewilldowellinher

5、exam.B. It+be+名词词组名词词组(nowonder,anhonour,agoodthing,apity,nosurprise,etc.)+that从句。如：Itsapitythatwecantgo.C. It+be+过去分词过去分词(said,reported,thought,expected,decided,announced,arranged,etc.)+that从句。如：ItissaidthatMr.GreenhasarrivedinBeijing.D. It+seem, happen等不及物动词及短语等不及物动词及短语+that从句。如：从句。如：Ithappenedtha

6、tIwasoutthatday.E. It+doesnt matter (makes no difference, etc.)+连接代词连接代词或连接副词引起的主语从句。如：或连接副词引起的主语从句。如：Itdoesntmatterwhethershewillcomeornot. How you got me blind is still a mystery. That she won the game made her very happy. What he said is not true. What they need is a dictionary. 结论结论 主语从句多位于主语从句多

7、位于_句首主语的位置句首主语的位置Try to draw a conclusion.找出下面句子中的连词。找出下面句子中的连词。Who will go makes no difference.Which is the best is not certain.Why dinosaurs died out is unknown.When and where we will get together has not been decided.How she can keep healthy is a secret.Whether he will come is not important.WhoWh

8、ichWhyWhenHowWhether Who will go makes no difference. Which is the best is not certain. Why dinosaurs died out is still unknown. When we will get together has not been decided. How she can keep healthy is a secret. Whether he will come is not very important.Who will goWhich is the bestWhy dinosaurs

9、died outWhen we will get togetherHow she can keep healthyWhether he will come找出主语从句。找出主语从句。1. If she will come is not important. Whether she will come is not important.2. If she will have enough time is a question. Whether she will have enough time is a question3. If he will hand in his homework is

10、a questions. Whether he will hand in his homework is a questions.结论结论1：在主语从句中只能用在主语从句中只能用whether,不能用不能用if 1. Where will the meeting be held is not decided. Where the meeting will be held is not decided. 2. When will the work be finished is unknown. When the work will be finished is unknown. 3. What

11、will he do after graduation is a question. What he will do after graduation is a question.结论结论2：主语从句应使用陈述句语序主语从句应使用陈述句语序注注 意：意：1.What you left are only several old books.2.What you said is of great importance.3.Whether hell come here is not clear. 1.“if” 不能引导主语从句，应有不能引导主语从句，应有“whether”引引导。导。3.主语从句的主

12、语从句的 “that” 一般不能省。一般不能省。4.“what”引导主语从句时，谓语动词：引导主语从句时，谓语动词： 1）常与其后的名词作表语一致）常与其后的名词作表语一致 2）根据句子的语）根据句子的语境而定。境而定。4. 主语从句需注意的问题主语从句需注意的问题2.主语从句中用陈述语序主语从句中用陈述语序1.Where shall we spend the holiday isnt decided.2.You have made a mistake is a fact.3.That is certain that we can win.4.No matter who leaves the

13、room last ought to turn off the lights.5.If the policemen will come is not certain.we shallThat you haveIt isWhoeverwhether改错练习改错练习1._ he made an important speech at the meeting was true. A. That B. Why C. What D. How 2. _well go camping tomorrow depends on the weather . A If B Whether C That D Where 3._ is known to us all is that America is a developed country_the First World.a.Which; belong to b. As, belonged to c. What; belonging to d. It; belonging to4. Its known to us all _ a form of energy . A.