高一必修三第三单元语法Grammar.ppt

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1、人教课标高一必修3Unit4Unit4Astronomy:thescienceofthestarsGrammarRewritethefollowingsentenceswithnounclausesasthesubject.1.Hisdiscoveryhasnotyetbeenproved.2.Dotheotherastronomersaccepthisideas?Itremainsaquestion.Whathasnotyetbeenprovedishisdiscovery.Whethertheotherastronomersacceptshis

2、ideasremainsaquestion.Discoveringusefulstructures3.Thefirstappearanceoflifeonearthisstillamysterytoscientists.4.Whyistheearthbecomingwarmer?Itisanimportanttopicforresearch.Howlifefirstappearedonearthisstillamysterytoscientists.Whytheearthisbecomingwarmerisanimportanttopicforres

3、earch.5.StephenHawkingat65experiencedzerogravityduringaflight.Itamazedeverybody.6.Plutoisnolongerconsideredaplanetinoursolarsystem.Whatasurprise!ItamazedeverybodythatStephenHawkingat65experiencedzerogravityduringaflight.ItisasurprisethatPlutoisnolongerconsideredaplanetinoursola

4、rsystem.主语从句及引导词主语从句在复合句中作句子的主语。引导主语从句的词有从属连词that,whether,if；连接代词who,whoever,whom,what,whatever,whose,which；连接副词when,where,how,why等。【例句呈现】观察下列例句，指出其中所包含的主语从句及引导词:1.Whatisneededforalongtripiscarefulpreparation.该句中主语从句是___________________________，引导词为_____。Whatisneededforawhatlo

5、ngtrip2.ThatJayZhouwillcometomycityexciteseverybody.该句中主语从句是_______________________________，引导词为_____。3.Whetherwewilltravelabroadornothasnotbeendecided.该句中主语从句是___________________________________，引导词为_________。ThatJayZhouwillWhetherwewillcometomycitythattravelabroadornotwhether

6、4.Whoeverknowsthesecretmustn’ttellothers.该句中主语从句是________________________，引导词为________。5.Itremainsapuzzlewhydinosaursdiedoutsuddenlylongtimeago.该句中主语从句是________________________________________，引导词为_____。Whoeverknowsthewhoeverwhydinosaursdiedwhysecretoutsuddenlylongtimeago【观察总结】

7、通过分析上面例句，同学们可能会发现上面第5句中的主语从句似乎比较隐蔽。其实，这也是主语从句的一种呈现方式，即：当一个句子主语过长时，可以用it作形式主语，而把真正的主语或主语从句后移至句子末尾，以保持句子的平衡。注意观察下列例句中的划线部分：Itisnotclearhowtheaccidenthappened.Itisnothardtounderstandwhyhedidsoatthattime.Itisapitythatyoushouldhavemadesuchacarelessmistake.Itisreportedthatmorethanthi

8、rtydeathswerecausedintheaccident.不难看出，虽然上面例句中都用it作形式主语