名詞性從句在句子中起名詞作用的句子叫名詞性從句.1賓語從句；2主語從句；3表語從句；4同位語從句主語從句在另外一個句子中做主語的句子叫主語從句。

Howthebookwillselldependsonitsauthor.

Thatheisthebeststudentintheclassisobvious

主語從句常用it作形式主語放句首因而我們常見到這種句式：It+be+n./adj/-ed從句（that,whether,etc.)例：It'sapitythatyoushouldhavetoleave.=Thatyoushouldhavetoleaveisapity.ItisgreatthatIhaveateacherlikeyou.=ThatIhaveateacherlikeyouisgreat.

Ⅲ.主語從句的連接詞一、主語從句連詞that(無詞義,不作成分,不能省略);whether(是否),if不能位于句首。Thathewillcomeandhelpusiscertain.Whetherwewillsucceedisstillaquestion.Itisnotknownifhewillcome.注意:已確定的事由that引導(dǎo);沒決定的事由whether引導(dǎo).

3.連接副詞when,where，why,how,howlong,howoften,howsoon,howfar,howmany/much等.Whenthetestwillbegivenisnotyetdecided.Howmuchwecanspendmustbeagreedon.2.連接代詞what,whatever,who,whoever,whose,which,whichever等.Whatheishasnothingtodowithyou.Whoseticketthisishasnotbeenfoundout.特殊句式1.Ihate____

whenpeopletalkwiththeirmouthsfull．（MET98）A.it

B.thatC.theseD.them2.Ifeel____strangethatheshouldbesocareless.A./B.itC.thatD.how3.Itworriedherabit

____herhairwasturninggrey.（MET92）A．whileB.thatC．if

D．for

為了使句子保持平衡，常用it來代替主語從句或賓語從句，而把主語從句或賓語從句放到后面，尤其是連詞that引導(dǎo)的主語從句常用于此種句式中，但what，whatever，whoever，whichever引導(dǎo)的主語從句一般不后置。

請你歸納

？同位語從句在一個更長的句子中作同位語使用的句子叫同位語從句。同位語與其前的詞或短語表達(dá)的是同一事物。如：Thefact

thatsheisillshouldbeconsidered.Thenews

thatourteamhaswonthematch

istrue.Hisdelayisdueto

thefactthatthecarwentwronghalfway.同位語從句同位語從句一般跟在名詞fact,news,promise,truth,belief,thought,idea,answer,information,doubt,knowledge,hope,law,opinion,plan,suggestion后面,用以說明或解釋前面的名詞.TheDifferencesBetweenAppositiveclausesandAttributiveClauses

怎樣區(qū)別同位語從句與定語從句同位語從句與定語從句的不同之處1、從句的作用不同：同位語從句用來進(jìn)一步說明前面名詞的內(nèi)容；定語從句用來修飾、限定前面的名詞。e.g.Thenewsthatourteamhaswonthefinalmatchisencouraging.（從句說明“消息”的內(nèi)容：我們隊取得了決賽勝利。）Thenewsthatyoutoldusisreally

encouraging.（從句對“消息”加以限定：是你告訴我們的，而非來自其他渠道。但消息是何內(nèi)容卻不得而知。）2、引導(dǎo)從句的關(guān)聯(lián)詞that的功能不同：that引導(dǎo)同位語從句時是一個純連詞，不充當(dāng)任何成分；而引導(dǎo)定語從句的that是關(guān)系代詞，既指代先行詞又須在從句中充當(dāng)成分。e.g.1)DadmadeapromisethathewouldbuymeCDplayerifIpassedtheEnglishtest.（that不充當(dāng)任何成分）2)Dadmadeapromisethatexcitedallhischildren.（that指代promise，又在從句中充當(dāng)主語。）高一英語語法同步輔導(dǎo)3、that引導(dǎo)同位語從句時是一個純連詞，故不能用which替換；而that引導(dǎo)定語從句時是代詞，常可以和另一關(guān)系代詞which替換。e.g.ThefactthatheisfromCanadaisnewtome.（that不可換為which）ThefactthatsurprisedmeisthatheisnotChinese.（第一個that可換為which，第二個不行，因為它引導(dǎo)的是表語從句。）4、引導(dǎo)同位語從句的關(guān)聯(lián)詞，除that外，還可以根據(jù)句義使用任何其它疑問代詞或副詞；而定語從句不可用what,how,whether等引導(dǎo)。e.g.IhadnoideaatallwhatIshoulddonext.

Thereisnoproofwhetherhewaskilledbyothers.同位語從句定語從句引導(dǎo)詞that只起連接的作用不充當(dāng)句子成分引導(dǎo)詞that除了引導(dǎo)句子外還充當(dāng)一定的句子成分同位語從句與前面的名詞是同位關(guān)系表示這個名詞的內(nèi)容定語從句對先行詞起修飾作用，表示“…的”。同位語從句的that一般不能省而定語從句中的關(guān)系代詞that，當(dāng)其在從句中做賓語時，常省略一.同位語從句注意點PracticeI.Tellthefunctionoftheclausesinthefollowingsentences說出下列從句的功能：A:Appositive（同位語）;B:Attributive（定語）Hisproposalthatwegothereonfootisacceptable.Manyteachersholdtheviewthatteenagersshouldnotspendtoomuchtimeonline.3.Thefirstrequestthathemadewastoaskforfreedom.4.Doyouhaveanyideawherewewillbesent?5.Isthisthecompanywhereyourfatherworks?6.Thisisthereasonthathegaveforhisabsence.7.Hemadeanexcusethathiscarbrokedownon

theway.1.Thenews____anotherpowerstationwillbebuiltcheeredallthevillagers.AwhichBthatCwhatDwhatever2Thenews____hetoldusisexciting.Whichofthefollowingiswrong?AwhatB\CwhichDthatExercisesBAII.Choosethebestanswer1.Theyexpressedthehope___theywouldcomeovertoChina.A.whichB.thatC.whomD.when2.Thefact___hedidn’tseeTomyesterdayistrue.A.thatB.whichC.whenD.what3.Ihavenoidea____hewillcomeback.A.whereB.whenC.whatD.thatBAB4.Thenews_____surprisedeverybodyyesterdaynowprovesto

befalse.A.thatB.whenC.whatD.how5.Oneofthemenheldtheview___thebooksaidwasright.A.whatthatB.thatwhichC.thatwhatD.whichthat6.Wordhascome_____someAmericanguestswillcomeforavisittoourcollegenextweek.A.whatB.whetherC.thatD.whichACCwhat與that在引導(dǎo)主語從句時的區(qū)別what引導(dǎo)主語從句時在句時在從句中充當(dāng)句子成分，如主語、賓語、表語，而that則不然。What引導(dǎo)的主語從句一般不可改為含形式主語的句子。例如：1)Whatyousaidyesterdayisright.2)Thatsheisstillaliveiscertain.Itisrightwhatyousaidyesterday.Itiscertainthatsheisstillalive.×√1.用that或what填空1.Iwonderifthisis______youarelookingfor.2.Ourschoolisquitedifferentfrom_______itwasbefore.3.Fathermadeapromise______ifIpassedtheexaminationhewouldbuymeacomputer.whatwhatthat4._______Ican’tunderstandiswhyhehaschangedhismind.5.___________theearthisroundisknowntousall.歸納：WhatThat連詞_______在從句中不作成分，不含有疑問意義，而_____在從句中作成分，常含有疑問意義。thatwhat1）____youdon’tlikehimisnoneofmybusiness.（S92)A.WhatB.WhoC.ThatD.Whether

高考題選萃2)____hesaidatthemeetingastonishedeverybodypresent.(93)A.WhatB.ThatC.ThefactD.Thematter3)There’safeelinginme___we’llneverknowwhataUFOis---notever.(s2002）A.thatB.whichC.ofwhichD.whatAA3.選擇填空

（what,whatever,who,whoever1._________wassaidheremustbekeptsecret.2._______weneedismoretime.3._______madethelongdistancecalltohimisnotimportant.4._________breaksthelawwillbepunished.WhateverWhatWhoWhoever

___________________等引導(dǎo)的名詞性從句不含有疑問意義，相當(dāng)于名詞后加一個定語從句，而____________________等引導(dǎo)的名詞性從句都含有疑問意義。請你歸納

who,whoever/what,

whatever?Whoever,whateverWho,what1.____hashelpedtosavethedrowninggirlisworthpraising.(s99)A.Wh