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时间:2020-08-04
《名词性从句主语从句课件.pptx》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、名词性从句第二讲:主语从句Unit4说出that/what/whether所引导的从句在主句中充当的成分,及引导词的功能。①Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.(what引导________从句,并在从句中充当________)②Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.(whether引导________从句,在
2、从句中不充当成分)③Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.(what引导________从句,并在从句中充当________)④Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.(what引导________从句,并在从句中充当________)⑤Itw
3、asnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.(that引导________从句,在从句中不充当成分)⑥Sowhetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.(第一个whether引导________从句;第二个whether引导________从句)答案:①主语;表语 ②主语 ③主语;主语 ④主语;宾语 ⑤主语 ⑥主语;宾语
4、一、基础点拨(一)定义在主从复合句中,充当主语的从句,即为主语从句。(二)引导主语从句的词及其在句中的功能1.连接词that和whether/ifthat引导主语从句,that在从句中不充当任何成分,仅起连接作用,但不能省略。whether/if引导主语从句,在主从句中不充当任何成分,起连接作用,但有自己的意义,也不可省略。①Thatshecouldcometohelpusmadeusveryhappy.她能来帮助我们使我们很高兴。②Thatthebigearthquakehadkilledmanypeoplefrightenedpeopleallovertheworl
5、d.大地震使很多人丧生令世界震惊。③Whethershewillcomeornotisstillaquestion.她是否会来仍是个谜。④Itisstillunknownif/whethertheplanwillbecarriedout.这个计划是否会实施还不知道。归纳拓展(1)whether引导的主语从句置于句首时,不可用if来替换。(2)if引导主语从句时,要用it作形式主语,将if引导的主语从句后置,此时whether与if可互换。2.连接代词who,whose,whom,what,which,whichever,whoever,whomever,whatever
6、等。连接代词引导从句,并在从句中作主语、宾语、表语或定语。①Whatsurprisedmemostwasthatthelittlegirlcouldplaytheviolinsowell.(what引导主语从句,并在从句中充当主语)最令我吃惊的是那个小女孩拉小提琴拉得那么好。②Whowillgototheconcertisnotknown.(who引导主语从句,并在从句中作主语)不知道谁会去听音乐会。③Whichbooktheywillchooseisstillunknown.(which引导主语从句,并在从句中作定语)不知道他们会选哪本书。④Whoeverbreaks
7、thetrafficrulesshouldbepunished.(whoever引导主语从句,并在从句中作主语)不论谁违反了交通规则都要受到惩罚。3.连接副词when,where,how,why,whenever,wherever,however等。连接副词引导主语从句并在从句中作状语。①Whenweshallholdoursportsmeetingisnotdecided.(when引导主语从句,并在从句中作时间状语)我们还没决定何时举行运动会。②Howtheywillreachthetopofthehighmountainisstil
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