主語從句

主語從句的定義主語從句是一個從句，它在句子中充當(dāng)主語的角色。也就是說，整個從句表示的是誰或者什么進行了句子的動作或者狀態(tài)。主語從句通常由一個連接詞引導(dǎo)，并且可以獨立成為一個完整的句子。

主語從句的分類1.由that引導(dǎo)的主語從句這種從句中，that作為連接詞，引導(dǎo)從句，但它在從句中不充當(dāng)任何語法成分，也沒有實際意義。-Thathewaslatewasobvioustoeveryone.（他遲到是眾所周知的。）2.由whether/if引導(dǎo)的主語從句whether或if引導(dǎo)的主語從句通常用于表達疑問或不確定性。注意，"If"通常不用于正式文體中。-Whetherhewillcomeisuncertain.-Ifhewillcomeisuncertain.(非正式)-Whetherhewillcomeornotisstillunknown.（他是否會來還不清楚。）3.由連接代詞或連接副詞引導(dǎo)的主語從句連接代詞WhatWhoWhichWhoseWhateverWhicheverwhoever連接副詞WhenWhereWhyHow連接代詞（who,what,which,whom等）和連接副詞（why,how,when,where等）引導(dǎo)的主語從句，它們在從句中充當(dāng)一定的語法成分。-Whowillwintheelectionisstillunknown.-Howhemanagedtodoitremainsamystery.-Whatshewantstodoisasecret.（她想要做什么是個秘密。）-Whyheleftisamystery.（他為什么離開仍然是個謎。）4.必須用it作形式主語的主語從句當(dāng)主語從句較長或者結(jié)構(gòu)較為復(fù)雜時，為了避免句子顯得頭重腳輕，通常使用it作為形式主語，而將從句放在句子的后半部分。-Itisclearthathehasmadeamistake.-Itisuncertainwhethertheywillarriveontime.-Itisimportantthatyoushouldstudyhard.（你努力學(xué)習(xí)是很重要的。）-Itisunknownwhetherhewillacceptthejoboffer.（他是否會接受這份工作邀請還不清楚。）

練習(xí)1.將以下句子改為使用"that"引導(dǎo)的主語從句：-Sheisstillalive.Thisisamiracle.答案-Thatsheisstillaliveisamiracle.2.將以下句子改為使用"whether"或"if"引導(dǎo)的主語從句：-Hewillcome.Thisisuncertain.答案-Whetherhewillcomeisuncertain.3.將以下句子改為使用連接代詞或連接副詞引導(dǎo)的主語從句：-Thepersonwillwintheelection.Thisisstillunknown.答案-Whowillwintheelectionisstillunknown.4.將以下句子改為使用"it"作為形式主語的主語從句：-Hehasmadeamistake.Thisisclear.答案-Itisclearthathehasmadeamistake.5.請將下列句子改寫為包含主語從句的句子：-Heknowsthatshelikeshim.-Theyarenotsureifhecanfinishtheworkontime.-Thequestioniswhattodonext.答案-Whatheknowsisthatshelikeshim.-Itisnotsurewhetherhecanfinishtheworkontime.-Whatthequestionisiswhattodonext.6.請選擇正確的連接詞完成下列句子：-______hewillcomeisuncertain.(whether/what)-______shedoesisasurprise.(that/why)-______heleftisamystery.(where/if)答案-Whetherhewillcomeisuncertain.-Whatshedoesisasurprise.-Whereheleftisamystery.練習(xí)1._______shelovesdancingisnosecrettoherfriends.2._______hewilljointhearmydependsonhisgraduationresults.3._______theyhadagreattimeatthepartyisobviousfromtheir笑容.4._______weshouldrespecteachotherisaprincipleofgoodmanners.5._______sheisthebeststudentintheclassiswidelyrecognized.練習(xí)6._______theyplantodelaythemeetinguntilfurthernoticehasbeenannounced.7._______hehasapassionforphotographyisevidentinhiswork.8._______youhavefinishedyourhomeworkisnotyetclear.9._______thesunrisesintheeastisafact.10._______shecanspeakmultiplelanguagessurprisesmanypeople.練習(xí)11._______theyareplanningtomovetoanewcityisapossibility.12._______hepassedtheexamwithflyingcolorspleasedhisparents.13._______youarelateforschoolagainisunacceptable.14._______theeconomywillrecovernextyearisstilluncertain.15._______shewillacceptthejobofferisuncertainatthemoment.練習(xí)16._______hehaschangedalotovertheyearsisundeniable.17._______theywillbeabletofindasolutiontotheproblemremainstobeseen.18._______youeathealthilyisimportantforyourwell-being.19._______hewaspromotedtomanagerisawell-deservedachievement.20._______shewillattendtheconferenceisstillupintheair.練習(xí)21._______theyhadtocancelthetripduetobadweatherisregrettable.22._______hemanagedtosolvetheproblemonhisownisimpressive.23._______youstudyhardwilldetermineyoursuccessinthefuture.24._______shehasastronginterestinmusicisclearfromherperformances.25._______theyarecomingtothepartytonightisarelief.練習(xí)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