选修6 Unit4 Language points.ppt

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1、1.Whatdoyouthinkgreenhousegasesdo?本句中think后接了一个由what引导的宾语从句。但应注意的是:特殊宾语从句即当一般疑问句主句的谓语动词是think,believe,suppose,consider,imagine,guess和suggest等时，表疑问的词要放在主句前即句首。例如：[正]Whodoyouthinkwillwininthegame?[误]Doyouthinkwhowillwininthegame?当然一般情况下宾语从句的疑问词应放在主句之后，例如：[误]Whydoyouknowwecan'tcutdownthebig

2、tree?[正]Doyouknowwhywecan'tcutdownthebigtree?2…itisarapidincreasecomparedtomostnaturalchanges.1).vt.比较；对照。compare…with…表示“把……与……相比(同类相比)”如：Compareyouranswerswiththoseatthebackofthebooktoseeiftheyareright.把你的答案同书后面的答案对照一下，看看是否正确。Myhandwritingcannotbecomparedwithmyfather’s.我的书法不能与我父亲的相比。2)

3、．vt.喻为；比拟。compare…to…表示“把……比做……（异类相比，比喻）”如：Man’slifeisoftencompareddoacandle.人生常被比为蜡烛。Shakespearecomparedtheworldtoastage.知识拓展comparedto/with与……相比,只能作状语Comparedto/withmanywomen,shewasindeedveryfortunate.莎士比亚把人世比做舞台。3.Howhasthiscomeaboutanddoesitmatter?comeabout:发生，造成相当于happenWhenMotherwo

4、keup,shedidn’tknowwhathadcomeabout.I’llneverunderstandhowitcameaboutthatyouwerelatethreetimesaweek.你知道那次空难是怎么发生的吗?随着电的使用，种种大变化发生了。Withtheuseofelectricity,greatchangeshavecomeabout.Doyouknowhowtheairaccidentcameabout?4.Thereisnodoubtthat….一、作不可数名词,作"疑惑;怀疑”①肯定句中doubt多接whether(一般不用if代替)同位语

5、从句。如:There'ssomedoubt________he'llkeephispromise.他会不会信守诺言还难说。Shehadherdoubts________thenewbookwouldsellwell.她怀疑新书是否会畅销。whetherwhether②否定句中doubt多接that同位语从句。如:Thereisnodoubt____theywillaskyouforhelp.毫无疑问,他们会请你帮忙的。Ihavenodoubt____youwillsucceed.我毫不怀疑你会成功的。thatthat二、作及物动词常用于下列句型中,作"怀疑;不能肯定;不

6、大相信"解,一般不用进行时态。①用于否定句或疑问句,后接that引导的宾语从句。如:Idon'tdoubt____heistellingthetruth.我毫不怀疑他在讲真话。Doyoudoubt____hewillwinthematch?你怀疑他会赢这场比赛吗?thatthat②用于肯定句,一般接whether或if引导的宾语从句.如:Idoubt__________wewillmakeaprofitoutofit.我认为我们不可能从此事中获利。Wedoubt__________shewillbepersuaded.我们不知道她会不会被说服。whether/ifwhe

7、ther/if5.subscribeto同意;赞成；订购常用于疑问句和否定句I’veneversubscribedtothetheorythatpeoplearemoreimportantthananimals.我从来没有同意过人比动物更重要的理论。2)Idon’tsubscribetotheideathatmoneybringshappiness.我不同意金钱能带来快乐的观点。6…itishumanactivitythathascausedthisglobalwarmingratherthanarandombutnaturalpheno