欢迎来到天天文库
浏览记录
ID:49963991
大小:1.57 MB
页数:40页
时间:2020-03-05
《高中英语 unit 4 Astronomy:the science of the stars 第2课时 Learning about Language课件 新人教版必修3.ppt》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、成才之路·英语路漫漫其修远兮吾将上下而求索人教版·必修3(通用本)Astronomy:thescienceofthestarsUnit4第二课时 LearningaboutLanguageUnit4名词性从句:主语从句课堂要点探究2课堂达标验收3课后强化作业4课前新知预习1课前新知预习说出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。①Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasoli
2、dglobe.(what引导________从句,并在从句中充当________)②Theearthbecamesoviolentthatitwasnotclearwhethertheshapewouldlastornot.(whether引导________从句,在从句中不充当成分)③Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearonitssurface.(what引导________从句,并在从句中充当________)④Whatmanyscientistsb
3、elieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.(what引导________从句,并在从句中充当________)⑤Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.(that引导________从句,在从句中不充当成分)⑥Sowhetherlifewillcontinueontheeart
4、hformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.(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;宾语课堂要点探究一、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
5、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。②Thatthebigearthquakehadkilledmanypeoplefrightenedpeopleallovertheworld.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/whethertheplanwillbecarriedou
6、t.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
7、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。④Whoeverbreaksthetrafficrulesshouldbepunished.(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,w
8、henever,wherever,however等。连接副词引导主语从句并在从句中作状语。①W
此文档下载收益归作者所有