资源描述：
《高一必修三-Unit-4-语法ppt课件.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、Unit4Astronomy:thescienceofthestarsLearningaboutlanguage必修三4.Tofindyourwaycanbeaproblem.Whatdoestheunderlinedpartserveasineachsentence?3.Smokingisbadforyou.2.Youareastudent.5.“Howdoyoudo?”isagreeting.6.Itiscertainthatweshallbelate.subject1.Beijingisourca
2、pital.1.Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsago…2.…itwasnotclearwhethertheshapewouldlastornot.Readthesentencesfromthetextandpayattentiontotheunderlinedparts.3.Whatisevenmoreimportantisthatastheearthcooleddown,waterbegantoappearo
3、nitssurface.4.Whatmanyscientistsbelieveisthatthecontinuedpresence…5.Whytheysuddenlydisappearedstillremainsamystery.NounclausesasthesubjectGrammar主语从句主语从句是在复合句中充当主语的从句，其功同名词一样。为了避免头重脚轻，常用it作形式主语,而把真正主语放在句子末尾。Howthebookwillselldependsonitsauthor.Thatheisth
4、ebeststudentintheclassisobvious.=Itisobviousthatheisthebeststudentintheclass.引导主语从句的关联词有三类：1)从属连词that。如:Thattheyweretruesisterswasclearfromthefacialresemblancebetweenthem.很明显,她们确是亲姐妹,她们的脸型很相似。2)从属连词whether。如：Whetherhe’llcomehereisn’tclear.他是否会来这里还不清楚。3)连
5、接代词who,whom,whose,what,which,whoever,whatever,whichever,连接副词where,when,how,why。Whatshedidisnotyetknown.她干了什么尚不清楚。Howthishappenedisnotcleartoanyone.这事怎样发生的,谁也不清楚。Whoevercomesiswelcome.不论谁来都欢迎。主语从句三要素hebecameagreatscientistisknowntousall.Iswhatyoutoldmerea
6、llytrue?谓语动词一般用单数从句用陈述语序不能省略关联词Notice:Whatweneedmostarebooks.How在主语从句中,谓语一般用单数。无论他说什么都不重要。Whateverhesaysisofnoimportance无论谁说这话都不对。Whoeversaysthatiswrong．但谓语动词用单数还是复数,不可一概而论,而要视句子的意义而定。WhatIneedismoney.WhatIneedarebooks.what与that在引导主语从句时的区别what引导主语从句时在从句中
7、充当句子成分,如主语、宾语、表语,而that则不然。1)Whatyousaidyesterdayisright.2)Thatsheisstillaliveisaconsolation.WhateverandwhoeverWhatever=anythingthatWhoever=anyonewho不管是谁犯了法,他都应该受到惩罚。Whoeverbreaksthelawshouldbepunished.=Anyonewhobreaksthelawshouldbepunished.whether与if①whe
8、ther之后可以直接跟ornot,而if则不能。Idon’tcarewhetherornotyourcarbreaksdown.Idon’tknowwhetherornothe’scoming.但是不可以说：Idon’tcareifornotyourcarbreaksdown.②whether引导的从句一般不可以为否定结构(选择问句的后一部分除外);而if则可以跟否定结构,如:Idon’tcareifshedoesn’tcome.Idon’
