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2019-2020年高中英语Unit4Astronomythescienceofthestars(第6课时)导学案新人教必修3第6课时第17周周三TeachingGoals:
1.TogetSstobetterunderstandthetext.
2.TohelpSsthemastertheusagesofimportantwordsandexpression
3.TogetSstoanalyzethedifficultsentencesofthetext.TeachingProcedures:StepIReadandfindoutthedifficultiesDivideSsintogroupsaskthemtoreadingroupsandfindoutthedifficultexpressionsandsentences.StepIIExplanationofdifficultiesAskstudentstolistouttheirdifficultiesonblackboard.Bydiscussingstudentscansolvesomeofthem.Analyzethedifficultiesbelow:
1.Whatitwastobeewasuncertainuntilbetween
4.5and
3.8billionyearsagowhenthedustsettledintoasolidglobe.随后它会变成什么没人能知道,直到38-45亿年前,这团尘埃才慢慢地形成一个固体的球状物【分析】a.此复合句的主句为Whatitwastobeewasuncertain;从句为_____引导的定语从句whenb.主句中包含一个由what引导的主语从句Whatitwastobeec.until是介词,与其前带否定前缀的形容词uncertain构成not...until句式,表示“到……才,在……之前”,引导between
4.5and
3.8billionyearsago作时间状语这句话还可以这样表述Nobodyknewwhatthecloudofdustwouldbeebeforeitturnedintoasolidglobebetween
4.5and
3.8billionyearsago.
2.Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.a.此复合句的主句为Theearthbecamesoviolent;从句为_____引导的结果状语从句thatb.so...that...如此……以致……,其中that可以省略c.结果状语从句中包含一个由whether引导的主语从句,____是形式主语it这句话还可以这样表述Peopledidn’tknowwhetherthesolidglobewouldkeeptheshapeornotbecausetheearthdidn’tstopexploding.
3.Theywereintimetoproducecarbon...whichweretomaketheearth’satmosphere.intime:soonerorlater;eventuallye.g.I’llseehimintime.intimeforsth./todosth.:notlatee.g.Shewillbebackintimetopreparedinner.与time相关的短语:innotime立刻马上attimes有时atatime每次;依次onceuponatime从前ontime按时;准时atonetime从前forthetimebeing暂时fromtimetotime不时地atmosphere意为“大气,气氛等”e.g.Therewasanatmosphereofviolenceandinsecurity.他们之间以前有种相互信任的气氛
4.Whatisevenmoreimportantisthatastheearthcooleddownwaterbegantoappearonitssurface.【分析】a.本句的结构是主语从句(Whatisevenmoreimportant)+系动词(is)+表语从句(thatastheearth...onitssurface.)b.表语从句中含有一个由___引导的时间状语从句这句话还可以这样表述Waterbegantoappearontheearthbecauseitcooleddownandthisismoreimportant.
5.Thisproducedachainreactionwhichmadeitpossibleforlifetodevelop.【考点】it作形式宾语,真正宾语常为不定式或从句【考例1】Wefeel_____ourdutytomakeourcountryabetterplace.AA.it B.this C.that D.one【考例2】Whydon’tyoubring_____tohisattentionthatyou’retooilltoworkonBA.that B.it C.his D.him【点拨】都选it都考查it作形式宾语考例1中,it指代tomakeourcountryabetterplace;考例2中,it指代_________________________thatyou’retooilltoworkon
6.Theyproducedyounggenerallybylayingeggs.lay-laid-laid-laying放把......放在......;产卵e.g.Helaidhisbooksonthedesk.注意:laylaid;laid;laying放置;产卵lielay;lain;lying躺;位于lielied;lied;lying说谎
7.…becausetheygavebirthtoyoungbabyanimals...【寓词于境】仔细阅读下列句子,并试着总结givebirthto的含义及用法1Mrs.Whitegavebirthtoafinehealthybabyinherlatethirties.2Marygavebirthtoahealthybabygirl.3Itwasthiseventthatgavebirthtothepeacemovement.【归纳】givebirthto后可直接跟名词,意为“_____”(句1和句2),也可意为“_____”(句3)分娩产生【拓展】atbirth出生时 since/frombirth自出生后 dateofbirth出生日期
8.Theyareputtingtoomuchcarbondioxideintotheatmospherewhichpreventsheatfromescapingfromtheearthintospace.他们把太多的二氧化碳释放到大气层中这就使得热量不能从地球上散发到太空中去阅读下列句子注意prevent...from的意思和用法1Therewasnothingtopreventherfromdoingso.2Wemustpreventthewaterfrombeingpolluted.3Theemperororderedhisporterstopreventthespeakerenteringthebuilding.[归纳]prevent...from的意思是___________________________from后多跟动词-ing形式句
1、句2;有时可省略from句3制止、阻止、使……不做某事[拓展]近义短语有:stop...from阻止……干某事;keep...from阻止……干某事注意:prevent和stop后的from都可以省略而keep...from中的from则不能省略,如果省略了其意义将发生改变StepIIIExerciseFinishexerciseson名师指津P55-56。