重點語法Unit5（原卷版）20212022學年高二英語上冊鏈接教材精準變式練（人教版2019）教材教材重點語法知識鏈接及典例解讀主語從句體會下面教材中句子的語法特征并說明畫線詞在句中所作的成分However,whatconcernedhimmostwasthatfarmersoftenhadpoorharvestsandsometimesevenhadaseriousshortageoffoodtoeat.Howthiscouldbedonewasachallengingquestionatthetime.3.Today,itisestimatedthatabout60percentofdomesticriceconsumptioninChinaisprisedofcropsgeneratedfromYuan'shybridstrains.4.WhatYuanLongpingreallycaredaboutwasnotmoneyorcelerity.一、概念在句中充當主語的從句稱為主語從句。英語中帶有主語從句的句型可分為兩大類：一是直接將主語從句放在主語的位置上；二是用it作形式主語，將真正的主語從句后移，放在其他成分之后。從句作主語時，謂語動詞一般用單數形式(what從句作主語時，如果含有復數概念時，謂語動詞可用復數形式)。Thatmathematicsisthebaseofotherscienceisknowntoallofus.Itisknowntoallofusthatmathematicsisthebaseofotherscience.眾所周知數學是其他科學的基礎。二、類型1．that，whether引導的主語從句：連詞只起連接作用，在從句中不充當句子成分，可用it作形式主語代替。Thathewonthegamemadeatremendousstirinourcountry.他贏得比賽一事在我國引起了巨大轟動。Whetheritwilldousharmorgoodremainstobeseen.此事對我們有害還是有利還有待于看一看。Itdependsonhowhardheworkswhetheronecansucceed.一個人能否成功取決于他工作努力的程度。[溫馨提示]if有時也可引導主語從句，但只能用it作形式主語，if從句后置。Itisdoubtfuliftheywille.他們是否會來值得懷疑。2．連接代詞what(ever)，which(ever)，who(ever)，whom(ever)，whose引導的主語從句：這類連詞除起連接作用外，還在從句中充當一定的句子成分，可作主語、賓語、表語或定語。Whatshedidafterthatisnotcleartous.那之后她做了什么我們不清楚。Whateverisworthdoingatallisworthdoingwell.凡是值得做的事都值得好好地做。Whichofallthosewaysisthebestisuncertain.所有那些方法中哪一個最好還不能肯定。Whomwemustserveisaquestionofvitalimportance.我們應當為誰服務是一個極為重要的問題。Whosecarelessnessspoilttheworkmustbemadeclear.必須查清是誰的粗心破壞了工作。Itisstillopentoquestionwhoistoheadthegroup.誰領導這個小組還未決定。3．連接副詞when，where，how，why引導的主語從句：這類連詞在從句中常作狀語，也可用it作形式主語代替。Whenandwherethemeetingwilltakeplacehasnotbeendecidedyet.開會的時間和地點還未決定。Whyhediditwillremainapuzzleforever.他做此事的原因將永遠是個謎。Itisnotclearhowaccuratetheresultsare.這些結果的精確程度還不清楚。三、it作形式主語的主語從句1．Itis/was＋形容詞＋主語從句Itisquiteclearthatthecrimehasbeendonedeliberately.十分明顯這是故意犯罪。Itwasclearenoughwhatshemeant.她的意思已經夠清楚了。Itisuncertainwhyhedeniedthecharge.不確定他為什么否認了指控。2．Itis/was＋名詞＋主語從句Itisagoodthingthatwedomorningexerciseseveryday.我們每天做早操是件有益的事。Itisapletemysterywhatcausedtheaccident.是什么引起了這場事故完全是個謎。It’snotmybusinesshowshechoosestolive.她選擇什么樣的生活不關我的事。3．Itis/was＋過去分詞＋主語從句Itisrequiredthatthemachineshouldbemaintainedatregularintervals.機器需要定期維修。Itisnotyetknownwhethertheywillsendadelegationtotheconference，butwehopetheywill.還不了解他們是否會派代表團來參加會議，但是我們希望他們派團來。Hasitbeendecidedwherewearetoholdthemeeting?決定了我們開會的地點了嗎？4．It＋不及物動詞＋主語從句IthappenedthatIwasn’ttherethatday.碰巧那天我不在那里。Itdoesn’tmatterwhatshelookslike.她的外表怎么樣并不重要。5．Itis/was＋介詞短語＋主語從句Itisofgreatimportancewhetherwecanimproveourscientificresearchornot.我們能否提高我們的科學研究是極為重要的。[溫馨提示]在Itisimportant/necessary/natural/essential/impossible...＋that從句和Itisdemanded/suggested/required/requested/proposed...＋that從句中，從句的謂語動詞用虛擬語氣，即(should)do形式。Itisnecessarythatascientificworker(should)knowforeignlanguages.科學工作者必須精通外語。Itisdesiredthatremotecontrol(should)beintroducedinthissystem.有人想要把遙控裝置引進該系統。四、主語從句中應注意的問題1．從句要用陳述語序Whatwewilldonextshouldbedecided.應該決定一下我們下一步該做什么。2．主謂一致(1)從句作主語時，主句的謂語一般用單數形式。Wherehewillgetajobaftergraduationhaspuzzledhimmuch.畢業后到哪兒找份工作使他很困惑。[溫馨提示]what引導主語從句時，有時主句的謂語動詞應與主句中作表語的名詞保持一致。Whattheschoolneedsmostarebooks.這所學校最需要的是書。(2)如果由and連接兩個或兩個以上的主語從句作主語時，謂語動詞用復數；由兩個或多個連接詞引導一個主語從句時，謂語動詞用單數。Whentheywillstartandwheretheywillgohavenotbeendecidedyet.他們將在什么時候動身以及要去哪里還沒定下來。Whenandwherethemoviewillbeshownisnotclear.這部影片何時何地上映還不清楚。一．用適當的詞填空（2020·上海浦東新區檢測）__________neveroccurredtohimthattheeasierthequestionswere,themorecarefulheshouldbe.2.Itissaid______heisworkingonabookaboutspaceexploration.But_____itwilleoutisupintheair.3.Don'tworry.______hewillofferushelpdoesn'tmatteralot.4._________,asamatteroffact,hasbeenputforwardattheconferenceisthatthegovernmentshouldencouragethegraduatestosetuptheirownbusiness.5.______________hewillgotoworkinamountainvillagesurprisesallofus6._________willbemadecaptainofourteamisstillunknown,butonethingiscertain:_____isputintothispositionistoleadusoutofthepresentdifficulty.7.________youcanmakeyourdreametruedependsonhardworkratherthanluck.8.______fashiondiffersfromcountrytocountrywillreflecttheculturaldifferencestosomeextent.9.Itisafact___________Englishhasbeenacceptedasaninternationallanguage.10.________iswillingtovolunteerintheBeijing2022OlympicWinterGamesisweletojoinus.11._________trulychangestheworldisthewayyoulookatyourself.12.___________isprovedisthatanimalsandinsectshavetheirownlanguages.13.（2020·天津靜海一中期末）____________I'mconcernedaboutmostis___________wecancollectahugeamountofmoneyinsuchashorttime.14.______thechildformedthehabitofplayingputergamesmadehismotherangry.15.（天津一中檢測）Webelieve_______youhavebeendevotedtoisnaturallyofgreatnecessity.二.單句語法填空1．______faultitisisquiteclearnow.2．_______takesinterestinthepapercanaskforacopy.3．Whenshewillebackschool_______(depend)onhermother.4．Itisuncertain______hisfamilywasoriginallyBritainorAmerican.5．Whattheywantatpresent_____(be)basicskillsforsurvivalinthewild.6．_____isdesirablethatweshouldreadtheinstructionsoftheinstrumentsinadvance.7．Itishardtoimagine_____lifewaslikeforheratthattime.8．It’simportantthatchildren_______(have)theirownhobbiesandinterests.9．Itisrequestedthatallthemembers_____(be)presentatthemeetingtomorrow.10_____theorymustgohandinhandwithpracticeisaprincipleweshouldalwayskeepinmind.三.完成句子11.他似乎要到10點鐘之后才能回來。12.有人建議我們應該立刻采取措施。13.我們今天所做的事在過去是不可能的。14.空氣中有多少水蒸氣取決于空氣的溫度。15.尊重所有少數民族的風俗習慣是很自然的。四.句型轉換1．HehappenedtobeoutofNewYorkatthetime.→__________________hewasoutofNewYorkatthetime.2．Itchancedthatshemethimintheparkthreedaysago.→_______________________________________threedaysago.3．Thisbookissaidtohavebeentranslatedintomanylanguages.→__________________thisbookhasbeentranslatedintomanylanguages.4．Youarelikelytosufferfrombadhealthifyoukeepsmoking.→_______________________youwillsufferfrombadhealthifyoukeepsmoking.5．Thatwaterismadefromoxygenandhydrogenismonknowledge.→_________________________waterismadefromoxygenandhydrogen.五.語法填空Myroommate，Mary，issensitive1._____otherpeople’sevaluationofherappearance.Everydaybeforeclass，shespendsmorethananhourinthedormitory2.____(make)up.Shehas20lipsticks，oftenfeeling3.______(bother)aboutwhichonetouse.Recently，shehasbeenaddictedtoaselfieappontheInternet，uploadingeditedphotoseverydayandho