主語從句用法小結(jié)

1、主語從句用法小結(jié)勉縣第二中學(xué)高二(7)班郭恬指導(dǎo)老師：李艷請觀察下列句子,注意主語從句的特點(diǎn)。1.Thattheearthtravelsroundthesunisawell-knownfact.Whethertheartistcandoitornotisuncertain.3.Whowillacttheleadintheplayhasnotbeendecidedyet.4.Wheretheyoungmanhasgoneisnotknown.5.Whenandwherethetestwillbegivenisnotyetdecided.【歸納總結(jié)】主語從句必須有引導(dǎo)詞；主語從句用陳述句語氣。引導(dǎo)

2、主語從句的詞有：連詞:that,whether；連接代詞:who,whose,whom,whoever,what,which等；連接副詞where,when,whenever,wherever,how,why等。主語從句引導(dǎo)詞的選擇：.連接詞:that,whetherThathewillwiniscertain.IthasbeenreportedthatsalesofbeefinChinawillincrease.Whetherweshallraiseducksorgeeseremainstobedecided.Whetherhelloinusinthediscussionisofgreati

3、mportance.連接代詞:who,whom,whose,what,which,whoever,whatever,whichever等。Itisclearwhoisafraidofhavingachangeinlandownership.Whosebagitiscannotbetold.WhatIndianeedsisalawtomakelandownershipfairer.Itisnotyetdecidedwhichcashcropwillbeproducednextyear.Whateverhesaidwasright.Whoevergotheremustgetreadyby6oclo

4、ck.連接副詞:when,where,why,how,howmany,howmuch,howlong,howsoon,howoften等。Whenwe11starttomorrowwillbetoldsoon.Wherewecanbuyoxenissomethingweneedtofindout.How/Whenhecamehereisnotknown.Howwecanprotectthegrainneedstobediscussed.Howmanypeoplediedfromstarvationthatyearwillneverbeknown.Howoftenhellgotoseehisgr

5、andmotherdependsonthetimehecanspare.歸納總結(jié)：主語從句引導(dǎo)詞的選擇主要是根據(jù)從句的結(jié)構(gòu)和意義來選擇。1.如果從句的意義和結(jié)構(gòu)完整，則用that。如果從句的意義和結(jié)構(gòu)不完整，則根據(jù)從句的意義和結(jié)構(gòu)選擇相應(yīng)的引導(dǎo)詞。比較that/whatWhathewantsisabook.Thathewantstogothereisobvious.Whathappenedisnotclear.ThisisthebestTVthatismadeinChina.定語從句ThefirstmuseumthathevisitedinChinawastheHistoryMuseum.定語

6、從句that和what的選用：that和what都可引導(dǎo)主語從句。但是，what除起連接作用外，還在主語從句中充當(dāng)成分，可做從句的主語、賓語、或表語。而that在主語從句中不充當(dāng)任何成分，只起連接作用。翻譯和分析下列句子：Itiswellreportedthatastormiscoming.Itistruethattheearthmovesaroundthesun.JtisapitythatImissedthetrain.Itdoesntmatterwhetherhewillcomeornot.Itseemsthatitisgoingtorain.Ithappenedthattheydidnt

7、knowmyaddress.歸納：為了使句子保持平衡，常用it來代替主語從句，而把主語從句放到后面，尤其是連詞that引導(dǎo)的主語從句常用于此種句式中。常用句型如下：It+be+名詞+that從句It+be+形容詞+that從句It+be+動詞的過去分詞+that從句It+be+不及物動詞+that從句Itslikely/possible/important/necessary/clearthat很可能/重要的是/必要的是/很清楚Itsknown/reported/thought/saidthat據(jù)說/據(jù)報(bào)道Itseems/appears/happensthat顯然、明顯、碰巧.Itsbeena

8、nnounced/declaredthat已經(jīng)通知/宣布Itsnowonderthat并不奇怪/無疑Itsapity/afact/acommonknowledge（眾所周知）/acommonsaying（俗話說）that主語從句常見錯(cuò)誤：下列各句均有一處錯(cuò)誤，請改正并分析原因。Lighttravelsfasterthansoundiscommonknowledge.改：在is后加thatothat雖無詞義但引導(dǎo)主語從句位于句首時(shí)不能省略。Ifshescomingornotdoesntmattermuch.改：將If變?yōu)閃hetheroif,whether都可表示是否，但訐不能引導(dǎo)位于主句之前的主語從句，它可以引導(dǎo)位于主句之后帶有形式主語it的主語從句。Thattheprofessorsaidisofgreatimportance.改:將That改為Whatothat引導(dǎo)主語從句時(shí)無詞義，只起一個(gè)連接的作用。Whattheprofessorsaid表示教授所說的,said后面還需要一個(gè)賓語，就只能用whatoWherewillthetreesbeplantedhasnotbeendecided.改：將will置于trees之后。主語從句要用陳述句語序。Nomatterwhobreakstherulewillbepunished.改：將Nomatter