【優(yōu)化課堂】高中英語 unit 4 section ⅱ learning about language 精品課件 新人教必修4

SectionⅡLearningaboutLanguage

Asaresultofthisevent,agreatdustcloudformedintheskyblockingoutthesunlight.因為這一事件，一大團塵埃在空中形成，擋住了陽光。

1．blockout擋住(光線)

典例Thatwallblocksoutallthelight.那堵墻把光線都遮住了。運用完成句子blockoutWeuseacurtainto________________(擋住)thesunshine.thatacometcrashedintotheearthlongagoandcausedthedisappearance很久以前一顆彗星撞上了地球并造成了這種滅絕2．crashvi.&vt.碰撞；墜落典例Themotorcyclecrashedintothefence.摩托車猛地撞在了圍欄上。拓展crashinto撞上；闖入運用完成句子

Theplane________________(撞上了)themountain.crashedinto主語從句主語從句在復(fù)合句中作句子的主語。主語從句的引導(dǎo)詞有：連接代詞：who,what,which,whoever,whatever,whichever連接副詞：when,where,why,how等從屬連詞：that,if/whether一、由連接代詞和連接副詞引導(dǎo)的主語從句

連接代詞和連接副詞在引導(dǎo)主語從句時，既起連接作用，又保留自己的疑問含義，在從句中充當(dāng)主語、賓語、表語、定語、狀語等成分。如：Whattheyareafterismoney.他們所追求的是金錢。Whentheywillcomehasn'tbeenmadepublic.他們什么時候來還沒有宣布。注意：what引導(dǎo)主語從句時，主句謂語動詞與表語保持數(shù)和意義上的一致，或是根據(jù)實際情況而定。如：Whatyouleftareonlyseveraloldbooks.你留下的只是幾本舊書。Whatyousaidisofgreatimportance.你所說的很重要。Whathehasdonemovemealot.他所做的事感動了我。二、由從屬連詞引導(dǎo)的主語從句

that引導(dǎo)主語從句時，本身無實際意義，只起連接作用，一般不可省略；if和whether引導(dǎo)主語從句時意為“是否”，但if引導(dǎo)的主語從句不可位于復(fù)合句句首。如：Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall.他在這么短的時間內(nèi)就完成了這篇文章使得我們都很驚訝。WhetherI'llattendthemeetinghasn'tbeendecided.＝Ithasn'tbeendecidedifI'llattendthemeeting.我還未決定是否參加會議。三、it作形式主語代替主語從句的情況

在含有主語從句的復(fù)合句中，有時為了避免句子頭重腳輕，常用it充當(dāng)形式主語代替主語從句放在句首，而把主語從句放在句末。用it作形式主語的that從句有以下四種不同的搭配：1．It＋be＋形容詞＋that從句

Itisnecessarythat...有必要…… Itisimportantthat...重要的是…… Itisobviousthat...很明顯……2．It＋be＋過去分詞＋that從句

Itisbelievedthat...人們相信……

Itisknowntous/allthat...眾所周知……Ithasbeendecidedthat...已經(jīng)決定……3．It＋be＋名詞＋that從句Itiscommonknowledgethat...……是常識Itisasurprisethat...令人驚奇的是……Itisafactthat...事實是……4．It＋不及物動詞＋that

從句Itappearsthat...似乎…… Ithappensthat...碰巧……Itoccurredtomethat...我想起……一、用適當(dāng)當(dāng)?shù)囊龑?dǎo)詞詞填空1._______youdon'tlikehimisnoneofmybusiness.2._______hesaidatthemeetingastonishedeverybodypresent.3._______theearthisbecomingwarmhasdifferentanswersindifferentgroups.4.____________we'llgocampingtomorrowdependsontheweather.ThatWhatWhyWhetherWhoeverWhatWhatever5._________leavestheroomlastoughttoturnoffthelights.6._________isneededforsuccessisyourhardwork.7.Itshockedus________hewasarobber.8.Itisstilluncertain________hewillcomehereornot.9.___________thelittleprincewantshasbeenlookedforallaroundthecountry.10._______________theywillarrivehasbeentoldtotheteacher.thatwhetherWhen/How4.________________(我我們們?nèi)缛绾魏稳トツ悄抢锢?isaquestion.5.__________________________(你你剛剛才才告告訴訴我我的的)isreally二、、完完成成句句子子1._________________(誰誰將將去去見見他他)hasn'tbeendecidedyet.2._______________________________________(哪哪個個學(xué)學(xué)校校會贏贏得得這這場場足足球球賽賽)hasnotbeenclearsofar.3.____________________________(他他能能否否買買到到機機票票)doesn'tmattermuch.WhatyoutoldmejustnowWhowillmeethimWhichschoolwillwinthefootballgameWhetherhecanbuyaplaneticketHowwegetthereimportant.6._________________________(他他什什么么時時候候出出國國)isbeingdiscussed.Whenhewillgoabroad7.________________(她她為為什什么么離離開開)isnotclear.8.Itisclear______________________(他是這這里的老板)．9.Itisnotclear__________________________________(我們將在哪哪里舉行籃