高中英语人教版必修3Unit4Astronomythescienceofthestarsperiod2教案1

课题：Unit4GrammarSubjectClause【学习目标】1.熟悉名词性从句中的主语从句及其功能；2.在实践中根据不同的语境选择使用正确的主语从句。【重点难点】重点:掌握名词性从句中的主语从句的具体用法难点:在翻译，写作及其相关的运用中熟练掌握课前自主预习方案PreviewingCase一、百思P64二、Findalltheexamplesinthereadingpassagewherenounclausesareusedasthesubjectandwritedown.ThentranslatethemintoChinese.(教师用书P90)___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________三、观察思考定义：常规主语从句，即在句子中担当_____的是一个从句,这个从句就叫做主语从句。主语从句的时态：不受主句的时态影响和限制。1.Haveatry:1)_______hefinishedwritingthepositioninsuchashorttimesurprisedusall.2)_______wewillgoforanoutingtomorrowremainsunknown.3)_______willbeourmonitorhasn'tbeendecidedyet.4)_______wemuststudyforisaquestionofgreatimportance.5)_______causedtheaccidentremainsunknown.6)_______youdidisright.7)_______watchwaslostisunknown.8)_______weneedistime.9)_______weneedaregooddoctors.2.小结:(1)引导主语从句连词有______________________________________________________等(2)连词位于句首不能______（省略）(3)主语从句大多数情况下视为______(单数/复数),但也有例外,如例句9（单数）1)That,2)Whether3)Who4)Whom5)What6)Whatever7)Whose8)What9)WhatExploringCase质疑探究质疑解惑，合作探究探究点一主语从句类型1.由连词that引导的主语从句:引导词that无含义,在句中不做成分,不可以省。

________youwillwinthemedalseemsunlikely.你想获得奖牌看起来是不可能的。

_________youaresoindifferentbothersme.你如此冷淡使我很烦恼。

________shesurvivedtheaccidentisamiracle.她在事故中幸免于难简直是奇迹。That/That/That2.用连词whether引导的主语从句:whether有含义(是否),在句中不做成分,不可以省。_________sheisingornotdoesn’tmattertoomuch.她来不来都无关紧要。3.用连接代词引导的主语从句(在由连接代词who,whose,whom,which,what,whoever,whomever,whichever,whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分).

_______youneedismorepractice.你所需要的是更多的训练。

_______Iwanttoknowisthis.我想知道的就是这事。

_______wedoistoservethepeople我们无论做什么都是为人民服务。What/What/Whatever4.用连接副词when,where,why,how引导的名词性从句(其连接副词有含义,在句中作状语。)_______weshouldstayitisaproblem.我们能呆在哪还是个问题_______theywillehasn’tbeenmadepubic.他们什么时候来还不知道。Where/when探究点二为了防止句子头重脚轻，通常把形式主语it放在主语位置，真正主语搁置于句末。eg.Itissaidthathehasgonetoshanghai.=HeissaidtohavegonetoshanghaiIthappenedthatthetwocheatswerethere.=Thetwocheatshappenedtobethere1.Itis/was+名词+从句

Itisa_____that…事实是……fact

___isgoodnewsthat………是好消息It

Itis__________that………是个问题aquestion

____ismonknowledgethat………是常识It类似的名词还有：apity；awonder；agoodthing；nowonder；surprise等。

Itisamysterytome_____itallhappened.这一切是怎么发生的是个谜。how

Itismonknowledge______thewhaleisnotafish.鲸鱼不是鱼，这是常识。that

Itisnosurprise_____Bobshouldhavewonthegame.鲍勃会赢得这场比赛，这不足为that2.Itis/was+形容词+从句

Itis__________that…有必要……necessary

Itis_______that…很清楚……clear

Itis_______that…很可能……likely

Itis_________that…重要的是……important

类似的形容词还有：strange;natural;obvious;true;good;wonderful;possible;unlikely;quite;unusual;certain;evident;worthwhile;surprising;interesting;astonishing,etc.

1)______________________conductorsandinsulatorsarebothimportantinindustry.Itisobviousthat很明显导体和绝缘体在工业中都很重要。

2)_____________________shewillbeabletoe.Itisdoubtfulwhether

她是否能来令人怀疑。

3)___________________________thatherefusedtotalktoyou.Itwasreallyastonishing

他拒绝和你说话真是令人惊讶。

4)_____________________________heshouldbeherebytheweekend.Itisessentialthat

周末之前，他应该到这里是必要的。

5)_________________________wecannotgoonlikethis.Itseems/isobviousthat

很明显我们不能这样下去了。

3.Itis/was+过去分词+从句

据说……______________________据报道……_______________________已证明……_______________________必须指出…______________________Itissaidthat…

Itisreportedthat…

Ithasbeenprovedthat…

Itmustbeprovedthat…

类似的过去分词还有：known;estimated;expected;believed;thought;hoped;noted;discussed;required;decided;suggested;demanded;madeclear;foundout,etc.1)Itisthoughtthatheisthebestplayer.大家都认为他是最好的选手。

2)Itis___________thatthevaseis2000yearsold.estimated据估计这个花瓶有2000年的历史。

3)___________________thoughtthatanewstarmustbeduetoacollisionbetweentwostars.过去一直认为新星是由于两颗星星之间碰撞产生的。Itisusedtobethoughtthat

4)__________________________thenewroadistobeopenedtotraffic.还没弄清楚这条路将开始通车。Ithasnotbeenmadeclearwhen

5)________________________________Imissedmytrain,becausethereisanotherlater.没有赶上这趟火车没有关系，稍晚还有一趟。Itdoesnotmatterif

6)______________________Isawhimyesterday.碰巧我昨天看见他了。Ithappenedthat

注意：1)当“及物动词+宾语”较短时，也可用这种结构。

eg.ItshockedmethatPeterdidnottellanybodywherehewas.让我吃惊的是彼得没有告诉任何人他在哪里。

Itdoesnotinterestmewhetheryougoornot.我对你去不去不感兴趣。2)whatever,whoever等引导的主语从句通常不能用_____作形式主语。Whoeverhelpsthesurvivorsintheearthquakeshouldbepraised.4.it＋不及物动词＋从句Itseemsthat…似乎…Ithappenedthat…碰巧…小结:(1)以that引出的主语从句,常以形式主语_____引导.Itis+____/____/_____+that从句.名词/形容词/一些动词ed(2)Itisstrangethatheshoulddothat.Itisimportantthatweallshouldattendthemeeting.Itisstrangethatthemanshouldhavestucktohissillyideas.在有些tha