1、1选择性必修二选择性必修二 Unit 1 Science and scientists第四课时第四课时 Grammar-predicative clausesTeaching objective: master the target grammar- predicative clauses.Teaching focus: to use the grammar correctly.Teaching procedure:【课前预习案】【课前预习案】观察下面句子，注意划横线部分：观察下面句子，注意划横线部分：1.The person stood in front of you just now is
2、 headmaster.2.The door remained closed.3.My job is to teach you English.4.The reason why he came late was that his clock didnt work.【课内探究案】【课内探究案】1.What is the predicative？表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、代词、数词、动词过去分词、动词的-ing 形式、副词、介词短语、形容词、不定式和从句等来充当。2.表语从句的定义:The question is difficult.（ 表 ）The que
3、stion is who will do it.（ 表 ）在复合句中做表语的从句，叫做表语从句。它位于主句的系动词之后，对主语进行解释说明，使主语的内容具体化。3.可以接表语从句的系动词有：（1）状态系动词：be（2）感官系动词：feel , seem , look, appear ,sound, taste , smell（3）持续系动词：stand , lie , remain ,keep, stay（4）变化系动词：become ,get , grow , turn ,go , come, run, fall（5）终止系动词：prove, turn out24. 引导词从属连词：that
4、 / whether /as if /as though (if 不引导表语从句)连接代词：who / whom / whose / which/what连接副词：when / where / why / how(1)thatthat 在从句中仅起连接作用，无实际意义，在句中不作任何成分，不能省略。My opinion is that its getting better and better.(2)whetherwhether 在句子中不充当任何成分，但具有“是否”的意义。注意：if 不能引导表语从句。1The question is whether it is worth doing.2T
5、he question is whether we can win them.(3)as if/throughas if / though 引导表语从句时，在句子中不充当任何成分，但有意义。译为：似乎，好像。1He looks as if he were a rich man.2It sounds as if someone is knocking at the door.as if/as though 引导的表语从句如果是事实，就用陈述语气，如果与事实不符，就用虚拟语气(主句一般现在时，从句就用一般过去时。主句是一般过去时，从句用过去完成时 )。The young man with long
6、 hair looks as if he were a girl.Dark clouds are gathering. It looks as if its going to rain.(4) what 在表语从句中充当主语、宾语或表语表示什么，什么样子，或所的（人或事）The question is what caused the accident.That mountain is no longer what it used to be .What he told you was what had been discussed at the meeting.(5)who 在表语从句中充当主
7、语、宾语或表语,表示谁1. The problem is who could do the work2. My trouble is who (whom) I can turn to.3. Could you tell me who he is?(6) which 在引导表语从句时,常充当定语，表语表示哪一个,哪一些。I read about it in some book or another,but what I don tknow is which (book) it is.3(7)where, when, why, how 除在句中起连接作用外，在从句中还充当时间、地点、方式、原因状语
8、，本身具有词义。This is why she was late for the meeting.这就是她会议迟到的原因。The question is how he did it.问题是他如何做此事的。That is where he was born.那就是他出生的地方。注意：主语一般不用 reasonThat/It is /was why 那是的原因That/It / is/ was because 那是因为He was ill.Thats because he was sent to the hospital.(强调原因）He was ill.Thats why he was sent
9、 to the hospital. （强调结果）5. 使用虚拟语气的表语从句My suggestion is that we (should) start early tomorrow.在表示建议、劝告、命令含义的名词后的表语从句，谓语动词需用“should+动词原形” 表示，should 可省略。常见的词有：advice, suggestion, order, proposal等。【课后巩固案】【课后巩固案】I.单项选择单项选择1.The reason why he failed is _he was too careless.A. becauseB. thatC. forD. becaus
10、e of2.This is _ Sara was late for the meeting.A. whyB. whatC. howD. That3. The reason is _ he is unable to operate the machine.A. becauseB. whyC. thatD.Whether4The problem is _to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is _ he
11、 likes the gift given by us.A.thatB. ifC. whetherD.不填6. The reason is_I missed the bus.A. thatB. whenC. whyD. what47. Thats _ the Party called on us to do.A. whyB. whatC. howD. that8. The reason is _ he is unable to operate the machine.A. becauseB. whyC. thatD.Whether9 .That is _ they separated.A. t
12、hatB.whatC.whichD.where10.Jane is no longer _ she was four years ago.A. whatB.whichC. thatD.whenII.选词填空选词填空as ifthatwhatwhowhenhowwhywhosewhichwhetherA:Absolutely ! You may not believe it, but that was _happened at theinitial stage of our groups research on developing a vaccine for malaria.B: Yes, i
13、t is.And it seemed _all the theories were useful, but the factwas_ we couldnt persuade one another that one theory was better thananother.C:Exactly The problem was not about _all our theories were equallygood, but in deciding _theory to depend upon.D: We realized that what we cared about was not_ as
14、pect we neededto develop a theory in, but rather _we can reduce the cost of avaccine without reducing its effect!E: Youre right.At last, we became focused on the key issue, which was _wehad to Cary out the research in the first place.III.完成句子1)The fact was _.事实是他没有做真正的尝试。2) The question is _.问题是这部电影是否值得看。3) Now _ she had known Millie for years.现在看起来好像她认识米莉已有好多年了。4) My advice is that you_as often as possible. 我的建议是你要尽可能经常地联系说英语。5) Thats _.那就是我第一次遇见她的地方。6) The problem is _.问题是谁才真正适合做这份艰苦的工作。Homework:Finish the exercises on their workbooks.5
