人教版（2019）选择性必修第一册Unit 5 Working The Land Discover Useful Structures 课件

主语从句Unit5DiscoverUsefulStructures句子类型简单句并列句复合句主句形容词性从句(定语从句)名词性从句副词性从句(状语从句)主语从句宾语从句表语从句同位语从句从句如果一个从句在句子中担当主语,那么这个从句就是主语从句。主语从句通常放在主句的谓语动词之前。引导的连接词有：从属连词、连接代词和连接副词。一、主语从句从属连词：that、whether连接代词：what、which、who、whom、whose、whatever、whichever、whoever连接副词：when、where、why、how二、主语从句的连接词从属连词：that

/

whetherThathewillpasstheexamiscertain.Whetherhewillpasstheexamisuncertain.that_______成分,____意义,______省略。whether_____成分,____意义,译为_____。不做是否无不能不做有只起连接作用,在主语从句中不充当任何成分。连接代词what/which/who/whom/whose/whatever/whichever/whoeverWhowilltakepartinthemeetinghasnotbeendecided.Whatshesaidistrue.WhichbookIshallchoosehasn’tbeendecided.Whoeverbreaksthelawwillbepunished.Whateverhedidwasright.Whicheverofyoucomesinwillreceiveaprize.既起连接词的作用,同时在从句中充当主语、宾语、表语或定语。连接副词：when/where/why/howWhentheywillstartisnotknownyet.Wheresheisfromisunknown.Whyhewaslateisnotimportantnow.Howshekeepshealthyisasecret.既起连接词的作用,并在从句中充当状语。类别例词说明Summary从属连词连接代词连接副词that,whetherwhat,which,

who,whom,whose,whatever,whichever,whoeverwhen,where,why,how只起连接作用,在从句中不作成分既起连接作用,并在从句中作主语/宾语/表语/定语既起连接作用,并在从句中作时间/地点/原因/方式状语为了避免主语冗长,使句子保持平衡,常用

____做形式主语,而将主语从句放到______。it后面Thatastormiscoming

isreported.Itisreported

thatastormiscoming.主语从句太长怎么办？在“Itisnecessary/important/natural+that从句”

中,从句常用虚拟语气,即从句谓语用“should

+动词原形”

的形式,

should可以省略。(1)It

+

be+adj

+主语从句三、常用it作形式主语代替主语从句的句型形容词：obvious,true,natural,likely,possible,

certain等Itisobviousthatyou’vemadeabigmistake.过去分词：said,believed,reported,thought,expected,agreed,decided,

suggested等(2)It

+

be+过去分词+主语从句Itisagreedthatallofusaretostartatsixo’clocktomorrowmorning.当过去分词是suggested,advised,ordered,requested,required等表示建议、要求、命令等的词语时,从句要用虚拟语气,即从句的谓语用“should

+动词原形”

的形式,should可以省略。名词短语：no

wonder,anhonour,apity,ashame,nosurprise,afact等(3)It+

be+名词短语+主语从句Itisapitythatshehasmadesuchamistake.Itisnosurprisethatourteamhaswonthegame.Ithappensthat...碰巧…Itappears/seemsthat…似乎/好像…(4)It

+不及物动词

+主语从句主语从句应使用_________语序。Wherewewillhaveapicnicshouldbediscussed.Wherewillwehaveapicnicshouldbediscussed.Howwegoforapicnicshouldbediscussed.Howdowegoforapicnicshouldbediscussed.陈述√√××

即主语在前,谓语在后。1.

从句的语序四、主语从句中应注意的问题Whetherthepatientwillbetaken

______unknown.Whenandwherethepatientwillbetaken_____unknown.由两个或多个连接词引导同一个主语从句时,谓语动词用单数。isis2.

主谓一致从句作主语时,主句的谓语一般用单数形式。Whenthetaskcanbefinishedandwhetherhecanhavearest_____unknown.Whathewantsmost____stayingwithhisfamily.What