主语从句讲解课件高三英语上学期一轮复习专项

主语从句

主语从句的定义主语从句是一个从句，它在句子中充当主语的角色。也就是说，整个从句表示的是谁或者什么进行了句子的动作或者状态。主语从句通常由一个连接词引导，并且可以独立成为一个完整的句子。

主语从句的分类1.由that引导的主语从句这种从句中，that作为连接词，引导从句，但它在从句中不充当任何语法成分，也没有实际意义。-Thathewaslatewasobvioustoeveryone.（他迟到是众所周知的。）2.由whether/if引导的主语从句whether或if引导的主语从句通常用于表达疑问或不确定性。注意，"If"通常不用于正式文体中。-Whetherhewillcomeisuncertain.-Ifhewillcomeisuncertain.(非正式)-Whetherhewillcomeornotisstillunknown.（他是否会来还不清楚。）3.由连接代词或连接副词引导的主语从句连接代词WhatWhoWhichWhoseWhateverWhicheverwhoever连接副词WhenWhereWhyHow连接代词（who,what,which,whom等）和连接副词（why,how,when,where等）引导的主语从句，它们在从句中充当一定的语法成分。-Whowillwintheelectionisstillunknown.-Howhemanagedtodoitremainsamystery.-Whatshewantstodoisasecret.（她想要做什么是个秘密。）-Whyheleftisamystery.（他为什么离开仍然是个谜。）4.必须用it作形式主语的主语从句当主语从句较长或者结构较为复杂时，为了避免句子显得头重脚轻，通常使用it作为形式主语，而将从句放在句子的后半部分。-Itisclearthathehasmadeamistake.-Itisuncertainwhethertheywillarriveontime.-Itisimportantthatyoushouldstudyhard.（你努力学习是很重要的。）-Itisunknownwhetherhewillacceptthejoboffer.（他是否会接受这份工作邀请还不清楚。）

练习1.将以下句子改为使用"that"引导的主语从句：-Sheisstillalive.Thisisamiracle.答案-Thatsheisstillaliveisamiracle.2.将以下句子改为使用"whether"或"if"引导的主语从句：-Hewillcome.Thisisuncertain.答案-Whetherhewillcomeisuncertain.3.将以下句子改为使用连接代词或连接副词引导的主语从句：-Thepersonwillwintheelection.Thisisstillunknown.答案-Whowillwintheelectionisstillunknown.4.将以下句子改为使用"it"作为形式主语的主语从句：-Hehasmadeamistake.Thisisclear.答案-Itisclearthathehasmadeamistake.5.请将下列句子改写为包含主语从句的句子：-Heknowsthatshelikeshim.-Theyarenotsureifhecanfinishtheworkontime.-Thequestioniswhattodonext.答案-Whatheknowsisthatshelikeshim.-Itisnotsurewhetherhecanfinishtheworkontime.-Whatthequestionisiswhattodonext.6.请选择正确的连接词完成下列句子：-______hewillcomeisuncertain.(whether/what)-______shedoesisasurprise.(that/why)-______heleftisamystery.(where/if)答案-Whetherhewillcomeisuncertain.-Whatshedoesisasurprise.-Whereheleftisamystery.练习1._______shelovesdancingisnosecrettoherfriends.2._______hewilljointhearmydependsonhisgraduationresults.3._______theyhadagreattimeatthepartyisobviousfromtheir笑容.4._______weshouldrespecteachotherisaprincipleofgoodmanners.5._______sheisthebeststudentintheclassiswidelyrecognized.练习6._______theyplantodelaythemeetinguntilfurthernoticehasbeenannounced.7._______hehasapassionforphotographyisevidentinhiswork.8._______youhavefinishedyourhomeworkisnotyetclear.9._______thesunrisesintheeastisafact.10._______shecanspeakmultiplelanguagessurprisesmanypeople.练习11._______theyareplanningtomovetoanewcityisapossibility.12._______hepassedtheexamwithflyingcolorspleasedhisparents.13._______youarelateforschoolagainisunacceptable.14._______theeconomywillrecovernextyearisstilluncertain.15._______shewillacceptthejobofferisuncertainatthemoment.练习16._______hehaschangedalotovertheyearsisundeniable.17._______theywillbeabletofindasolutiontotheproblemremainstobeseen.18._______youeathealthilyisimportantforyourwell-being.19._______hewaspromotedtomanagerisawell-deservedachievement.20._______shewillattendtheconferenceisstillupintheair.练习21._______theyhadtocancelthetripduetobadweatherisregrettable.22._______hemanagedtosolvetheproblemonhisownisimpressive.23._______youstudyhardwilldetermineyoursuccessinthefuture.24._______shehasastronginterestinmusicisclearfromherperformances.25._______theyarecomingtothepartytonightisarelief.练习26._______thegovernmentwillapprovethenewprojectisuncertain.27._______hewillbeabletoreturntoworknextweekishopeful.28._______shewantstopursueacareerinartisherdream.29._______youunderstandtheinstructionsiscrucialforthetask.30._______theteamwillwinthechampionshipisamatterofspeculation.答案1.Thatshelovesdancing2.Whetherhewilljointhearmy3.Thattheyhadagreattimeattheparty4.Thatweshouldrespecteachother5.Thatsheisthebeststudentintheclass答案6.Thattheyplantodelaythemeeting7.Thathehasapassionforphotography8.Whetheryouhavefinishedyourhomework9.Thatthesunrisesintheeast10.Thatshecanspeakmultiplelanguages答案11.Thattheyareplanningtomove12.Thathepassedtheexam13.Thatyouarelateforschool14.Whethertheeconomywillrecover15.Whethershewillacceptthejoboffer答案16.Thathehaschangedalot17.Whethertheywillfindasolution18.Thatyoueathealthily19.Thathewaspromoted20.Whethershewillattendtheconference答案21.Thattheyhadtocancelthetrip22.Thathemanagedtosolvetheproblem23.Thatyoustudyhard24.Thatshehasastronginterestinmusic25.Thatth