高中英语《unit4 astronomy the science of the stars》教案（3）新人教版必修3

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1、Period3LanguagepointsinreadingTeachingGoals:1.TogetSstobetterunderstandthetext.2.TohelpSsthemastertheusagesofimportantwordsandexpression3.TogetSstoanalyzethedifficultsentencesofthetext.TeachingProcedures:StepIReadandfindoutthedifficultiesDivideSsintogroups,askth

2、emtoreadingroupsandfindoutthedifficultexpressionsandsentences.StepIIExplanationofdifficultiesAskstudentstolistouttheirdifficultiesonblackboard.Bydiscussing,studentscansolvesomeofthem.Analyzethedifficultiesbelow:1.Whatitwastobecomewasuncertainuntilbetween4.5and3.

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Whatitwastobecomewasuncertain；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Whatitwastobecome。c.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

4、between4.5and3.8billionyearsago作时间状语。这句话还可以这样表述：Nobodyknewwhatthecloudofdustwouldbecomebeforeitturnedintoasolidglobebetween4.5and3.8billionyearsago.2.Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.a.此复合句的主句为Theearthbecamesoviolent；从句为_____

5、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’tknowwhetherthesolidglobewouldkeeptheshapeornot,becausetheearthdidn’tstopexploding.3.Theywereintimetoproducecarbon,...,whichweretomaketheearth’satmosph

6、ere.intime:soonerorlater;eventuallye.g.I’llseehimintime.intime(forsth./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

7、”。e.g.Therewasanatmosphereofviolenceandinsecurity.他们之间以前有种相互信任的气氛。4.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.【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

8、句话还可以这样表述：Waterbegantoappearontheearthbecauseitcooleddown,andthisismoreimportant.5.Thisproducedachainreaction,whichmadeitpossibleforlifetodevelop.【考点】it作形式宾语，真正宾语常为不定