Unit4BreakingBoundariesGrammar课件-高中英语选择性

Unit4BreakingBoundaries

Grammar

Itasanemptysubject

WatchandThinkWhatwehavelearntaboutitbefore1.Iboughtanewhouseanditneededtobepaintedanddecorated.(it----anewhouse)2.What’sthatItisanewdevice.(it----that)3.Someonemusthavebeenhere.Butwehavenoideawhoitwas.it----acertainperson4.Thenewcouplegotababyanditwasverylovely.(it---ababy)5.HesmokedinbedandIdon’tlikeit.(it------Hesmkoedinbed)6.Bythattime,thepandanolongerneeded____(it)motherforfood.7.Thecatcanwash_____(it)BBythattime,thepandanolongerneeded____(it)motherforfood.ythattime,thepandanolongerneeded____(it)motherforfood.Bythattime,thepandanolongerneeded____(it)motherforfood.6.Thecatcanwash______.Bythattime,thepandanolongerneeded____(it)motherforfood.6.Thecatcanwash______.What’sthisanewmachine.itsitselfit作为人称代词，可以指前面提到的事物，或特定的人或不知性别的婴儿。也可以指前面提到的片语或整个句子，此时，相当于that。物主代词和反身代词为itself8.Itisalovelyday,isn’t9.Itwasnearlymidnightwhenshecameback.10.ItisMarch8,Women’sDay.11.Itissome2,300kilometersfromBeijingtoGuangzhou.12.Itis39degree!Youmayhavegotafever.13.Itis15dollors.14.Itliesatthefootofthemountain.s39degree!Yougotahighfever!it作为无人称代词，可以是时间、地点、距离、天气、气温等自然现象。温馨提示：当我们在表示今天、明天、昨天干什么或是什么，用it作主语，今天、明天、昨天作状语，如：今天是星期五：ItisFradaytoday.一般不能翻译成：TodayisFridayWatchandThinkWhatwewilllearnaboutitfromthefollowing1.Butitisvitalnottotakeanychances.2.whenIsawthetragicscenesonthenews,Ifeltitwasmydutyasadoctortogothereandoffermyhelp.3.Ittookthemayeartobuildthebridge.4.Itisawasteoftimedoingsuchuselessthings.5.ItissuggestedthateachstudentsinganEnglishsongattheclassmeeting.6.Itdoesn’tmatterwhetherhecomesornot.以上例句中的it作形式主语，真正主语为不定式（短语）、动名词（短语）或从句。it常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而将真正的主语后置it常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而将真正的主语后置常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而将真正的主语后置。常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而it常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而将真正的主语后置。将真正的主语后置。

it常代替由不定式短语、动名词短语或从句表示的真正主语，作形式主语，而将真正的主语后置。it作形式主语，所代替的是句子的逻辑主语，并无实际词义还可以保持句子的结构平衡，避免主语过长，显得头重脚轻。it作为形式主语主要分为三种情况。一、代表不定式，根据句子的谓语又可分为谓语四种类型：1.1）be+形容词+（for/ofsb.)+不定式egAsfarasi’mconcerned,itisnecssaryforustodealwithstress.Itisreallykindofyoutogivemealifthome.2.be+名词+不定式(Itis+n.+todosth.)

egItwasherdutytocleantheroom.Itisashameforustohavelostthegame.3.be+介词短语+不定式

egIt

wasagainstmyprincipletodothat.4.及物动词+宾语+不定式

Itcost150yuantobuytohbuythedress.Ittookmeayeafinishit.edress.Ittookmeayeartofinishit.二、代表动名词，一般以“be+名词”作谓语。It’snouse/good/fun/awasteoftimedoingsth.Itisawasteoftimedoingsuchuselessthings.Itisnousegivinghimsomeconstructiveadvice.做某事没有用/没有好处/没有意思/是浪费时间三、代表从句，具体可分为六种类型：1.It+be+形容词+从句(Itis+adj.+从句)egItisnaturalthatsheshouldknoweverythingaboutit.2.It+be+名词+从句(Itis+n.+从句)Itisaquestionhowhedidit.Itisnowwonderthatheisasleep3.It+动词的被动语态+从句(known,said,reported,agreed...)egItisnotdecidedwhowilltakeoverthecompany.4.It+be

/其他系动词(seem,look)+that从句

egItmaybe/seemsthatheviewstheissuefromadifferentperspective.5.It+动词+that....1)Ithappenedthattherewasadoctoronthespot.2)Ithit/occurredtome/struckmethatIhadn’tfinishedmyhomework.6Itdoesn’tmatterwhether/if…Doesitmatterif/whether...Itdoesn’tmatterifyoumissthebus,becausethere’sanotherone15minuteslater.注意事项：1.Itisimportant/necessary/right/strange/natural/…that…(should)do…Itisanecessarythatyoudoenoughexercisesbeforetherace.2.Itbe+suggested/ordered/advised/commended/required...that(should)+doIsuggestedthatweplayagameofchess.---Who’sthatatthedoor---____isthemilkman.四四、it的其他常见句型1）该是我们回家的时间了。Itistimethatweshouldgo/wenthome.2)我收到你的信两天了。ItisthreedaysthatIreceivedyourletter.3)这是我第一次参观长城。It/This/ThatisthefirsttimethatIhavevisitedthegreatWall.4)过两周我们就要考试了。Itwillbetwoweeksbeforewetakeanexam.5)我三点完成作业。Itwasthreeo’clcokwhenIfinishedmywork.6)这是我读过的最好的一本小说了。It/That/ThisisthebestnovelthatIhaveeverread.7)Heiscleverandstudieshard.AndItisthesamewithhisbrother.8)我是在昨天的聚会上认识他的。Itwasattheyesterdaay’spartythatigottoknowhim.__________________________________7)Itisthesamewithsb./sth.Heiscleverandstudieshard.And__________________________（他哥哥也一样）。1.Itistimethat...did/shoulddo...2.Itis(hasbeen)/was(hadbeen)+段时间名词+since...did/haddone3.It/This/Thatis/wasthefirst/...timethat...havedone/haddone...4.Itwill(won’t)be/was(not)+段时间名词+before...do/did...5.Itwas+点时间+when...did...6.It/This/Thatis/was+最高级+that...havedone/haddone...7.已的情况也适合于甲的情况。Itisthesamewith.../Itistrueof.../Soitiswith...

8.强调句：Itis/was+被强调部分+who/that+原句剩余部分

做某事没有用/没有好处/没有意思/是浪费时间五、常见therebe句型和it形式主语的辨析：（翻译下面各句）1.找到你家困难。_____________________________________________2.他很诚实，这没有任何怀疑。__________________________________3.你没有必要担心他的安康。__________________________________4.和他争辩这个问题没有意义。___________________________________5.没有办法解决这个问题。_______________________________________6.Thereisnodenyingthefact...__________________________________7.Thereisnohurrytodosth.____________________________________8.没有时间去度假。____________________________________________1.Thereisdifficulty(in)findingyourhouse.2.Thereisnodoubtthatheishonest.3.Thereisnoneedforyoutoworryabouthishealth.4.Thereisnosense/point(in)arguingaboutthematter.5.Thereisnowayofsolving/tosolvetheproblem.6.不否认……7.没有必要匆忙做……8.Thereisnotimetospendaholiday.单击此处添加标题

巩固练习一、单句语法填空1.Fromtheteacher’spatientexplaintion,Ihavelearntwhatabigresponsibility____istoeducate.2.Iknow_____isimportanttoknowmyownlimitations,butwhatisdifficultistohelpotherstoknowtheirownlimitations.3.It_____(know)tousthatheisoneofthemostfamousfootballplayersintheworld.4.Itneveroccurredtome_____youcouldsucceedinpersuadinghimtochangehismind.5.______feltfunnywatchingmyselfonTV.6.Anaverageofjust18.75cmofrainfelllastyear,making____thedriestyearsinceCaliforniabecameastatein1850.7.Bythattime,thepandanolongerneeded____(it)motherforfood.单击此处添加标题8.Tooursurprise,thedooropenedof______(it).9.____,inthemiddleofthebush,wasalittlebird,singingtothesky.10._____isnowonderthatsuchatopstudentisaddictedtoonlinegames.11.______happenedthattherewasadoctorinthecrowds.12.Youcanneverimaginehowdifficulty_____wasfindingthemissingkidinthemountain.13.Itiscareless____youtomakesomanymistakesintheexam.14._____isnopointingettingupsetaboutit.---Let’sjusttrytofindasolution.15.---Who’sthatatthedoor---____isthemilkman.16._____isthreeyearssincemylittlebrotherjoinedthearmy.17.Itwon’tbelong_____wewillselebratedtheSpringFestival.18.Iwonderwhere_____wasthatyougottoknoweachother.19.Todaywecelebrate._____isexactlyonemonthsincethelastreportedcase.二、用it作主语，改写下面句子。1.Weallknowthattheyhavebrokentheirpromise.2.Togettomyschoolfrommyhomebybiketakesmehalfanhour.3.Don’tyouthinktryingtogetBettytochangehermindisawasteoftime4.Thatallhumanbeingscanmakeeadifferencetothesocietyismybelief.5.Asisreported,theEnglishsummercampwilloffermanyusefulcoursesavailabletoeveryone.6.Youarecarelesstomakesomanyspellingmistakesinthecomposition.7.S