it 用法公开课ppt.ppt

grammar,theuseof“it”,itisnevertoooldtolearn.,it,howmuchdoyouknowabout“it”?,theuseof“it”,代词it,引导词it,it句型归纳sentenceswith“it”,1.做人称代词，代替前文提到过的事物。,代词it,youbodybecomesaccustomedtohavingnicotineinit.,2.用以代替指示代词this,that。,-whosetext-bookisthat?-itshers.,-whatsthis?,-itsaflag.,asyouknow,ifyoudothesamethingoverandoveragain,youbegintodoitautomatically.,3.用以代替未知的人或婴儿。,someoneisknockingatthedoor.goandseewhoitis.,yourbody,thething,4.做非人称代词，指代时间、天气、距离、环境、季节、日期、价值等。,itstimeforclass.,itissummernowanditgetshotterandhotter.,itsabouttwokilometersfromheretomyhome.,itisveryquietinourclassroomeverynight.,代词it,-whatsthedatetoday?-itsmay15,2013.,-whatsthecostofthet-shirt?-itis150yuan.,时间,天气,距离,环境,季节,日期,价值,itwasasunnyday.peterdecidedtogoforawalktotheparkeventhoughitwas2milesaway.hewasjustabouttoleavethehousewhensomeoneknockedatthedoor.“whoisit?”,hethought.whenheopenedthedoor,hefoundnobodybutanoteontheground.hepickeditupandread.itissurprisingthatthenoteshouldhavebeengiventohisneighbour.,theuseofit,discover,天气,距离,未知的人,形式主语,note,2、itisnogoodsmoking.,3、itisamamazingthatatmyageiamstillfit.,真正主语,真正主语,形式主语,形式主语,真正主语,形式主语,=towalkonthestreetwassocomfortable.,=smokingisnogood.,=thatatmyageiamstillfitisamazing.,1、itwassocomfortabletowalkonthestreet.,引导词it,summary：it作形式主语，代替由不定式（或不定式复合结构）、动名词或从句表示的真正主语。,discovertheuseofit,此处adj.通常为描述人的形容词：kind;rude;silly，careful;careless;foolish;stupid;clever;wise.itskindofyoutohelpmewiththeproblem.,（1）itis+adj.+（forsb.）todosth.,此处adj.通常为描述事件的形容词：easy;hard;difficult;necessary;likely;impossible;important;useful;dangerousitisimportantforateenagertolearnenglishwell.,（2）itis+adj.+（ofsb.）todosth.,代替不定式,=tolearnenglishwellisimportanttoforateenager,=youarekindtohelpmewiththeproblem.,structures,e.g.itisfuntogooutforawalk.,（3）itis+名词+todosth.,常用的名词有：fun;pity,shame,pleasure.,不可数名词,itisashametobelateforclass,itisapleasuretohavethechancetohelpyou.,(5)itsnogood/usedoing,e.g.itsnousecryingoverspiltmilk.,(4)ittakessb.sometimetodo.,e.g.ittookme3daystopreparethislesson.,代替doing,常见的adj.有:possible;clear;obvious;true,etcitisveryclearthathegrowslikeatree.,(1)itis+adj.+that从句,(3)itis+v-ed+that从句,itissaid(reported/believed/thought/known/told/suggested.)that.译为“据说（据报道，据悉）”。itissaidthathehasgonetobeijing.itisreportedthatchairmanxiwillvisithangzhou.,(4)ithappens/seems/appears+that从句,itseemsthatthereisnowayoutofourdifficulty.,代替主语从句,(2)itis+n.+that从句,常见的n.有:ashame;apity,afact,etcitisapitythatyoumissedthefootballmatch.,作形式宾语，代替由不定式、动名词或从句表示的真正宾语。,hefeelsithisdutytohelpothers.,wethoughtitnousedoingthat.,引导词-it,hemadeitclearthathewasnotinterestedinthissubject.他非常清楚地表示他对那门学科不感兴趣。,注意：常用的动词有think,believe,make,find,consider,feel等。,注意：,在动词appreciate,dislike,hate，like,love等后面代替if或when等引导的从句。,iwouldappreciateitifyoucancome.,it代替if引导的宾语从句。,givingupsmokingisdifficult.itis2.someyoungpeoplethinktheylookattractivewhentheysmoke.itseems3.mostpeoplebelievesmokingcausescancer.itisbelieved4.donttrytoquitonastressfulday.itisnouse,thatsmokingcausescancer,thatsomeyoungpeoplethinktheylookattractivewhentheysmoke.,difficulttogiveupsmoking.,practice,tryingtoquitonastressfulday.,1、用it句型改写句子，意思不变。,5.chinaproducesonethirdoftheworldscigarettes.itisastonishing6.youarenotallowedtoadvertisecigarettesinthiscountry.itisillegal7.myfatherhasquitsmokingatlast.itiswonderful8.thenightwasdarkandstormywhentheoldmanstartedhisjourney.itwasa9.youcouldsufferfrombadhealthifyoukeepsmoking.itislikely10.youhavetotakepillstocontrolyourbloodpressure.itisnecessary,thatchinaproducesonethirdoftheworldscigarettes.,toadvertisecigarettesinthiscountry.,thatmyfatherhasquitsmokingatlast.,darkandstormynightwhentheoldman.,thatyoucouldsufferfrombadhealthif.,foryoutotakepillstocontrolyour.,2、用it句型把a句转换为b句，意思不变。1.a.tokeeporderinanimportantfootballmatchisahardjobforthepolice.b_forthepolicetokeeporderinanimportantfootballmatch.2a.torecitethepassagesinnewconceptenglishisaneffectivewayinenglishstudy.b._inenglishstudytorecitethepassagesinnewconceptenglish.,itisahardjob,itisaneffectiveway,3.a.imeantthatyoumightgowithoutme,butididntmakethatclear.b.ididnt_thatyoumightgowithoutme.4a.memorizing20englishwordsadayiseasyforme.b.ifind_20englishwordsaday.,makeitclear,iteasytomemorize,practice,5a.whowilltakeustovisitthenatureparkhasntbeendecidedyet.b._whowilltakeustovisitthenaturepark.6a.hegetsupearlyandrunsaroundtheplaygroundforhalfanhoureveryday.hehasmadethatarule.b.hehasmade_andrunaroundtheplaygroundforhalfanhoureveryday.,ithasntbeendecidedyet,itaruletogetupearly,7a.afireisreportedtohavetakenplaceintheexperimentalbuildingthismorning.b._afiretookplaceintheexperimentalbuildingthismorning.8a.ispenttwohourswritingtheessay.b._towritetheessay.,itisreportedthat,ittookmetwohours,everyoneconsideritimportanttohaveenoughsleep.theamountofsleepneededvariesfrompersontopersonanditdependsontheageofthepersonandtheconditionsinwhichsleeptakesplace.theyoungmayneedmoresleepthantheold,butitissaidthateighthoursareenoughforthehealthofgrownups.somecandowithlessthanthisamount,butothersmayneedmore.everypersonknowshisownneed.itisthenamatterofgoodjudgmenttosatisfyhisneed.sleepisessentialforourhealth.itisenoughsleepthatcanmakeonebringbackhisstrengthandgetreadyforadayswork.,issaidthat,tohaveenoughsleep,is,that,强调结构,tosatisfyhisneed,practice,3、辨别it的用法。,happynewyear!thegreetingwillbesaidandheardasanewyeararrives.itisatthistimeoftheyearthatfamiliesandfriendsgettogethertosaygoodbyetotheoldandwelcomethenew.itwastheoldestofallholidays.traditionally,itwasthoughtthatonecouldaffectthelucktheywouldhavethroughoutthecomingyearbywhattheydidorateonthefirstdayoftheyear.forthatreason,ithasbecomecommonforpeopletocelebratethefirstfewminutesofanewyearinthecompanyoffamilyandfriends.itisapopularbeliefthatanythingintheshapeofaringisgoodluck,becauseitsymbolizescomingfullcircle,completingayearscycle.,itisatthetimeoftheyearthat,itwasthoughtthat,practice,newyear,强调结构,itisnevertoooldtolearn.活到老，学到老。itiseasiertofallthantorise.摔倒容易爬起来难。itisnousecryingoverspilt（溢出的）milk.覆水难收。,proverbswith“it”,itneverrainsbutitpours(泼水).不鸣则已，一鸣惊人。ittakesthreegenerations（代）tomakeagentleman.十年树木，百年树人。,i.单项选择1.hedidntmake_clearwhenandwherethemeetingwouldbeheld.(天津2007)a.thisb.thatc.itd.these2._isourbeliefthatimprovementsinhealthcarewillleadtoastronger,moreprosperouseconomy.(浙江2006)a.asb.thatc.thisd.it,高考实例,3.thedoctoradvisedverastronglythatsheshouldtakeaholiday,but_didnthelp.(2005全国卷iii)a.itb.shec.whichd.he4.idappreciate_ifyouwouldliketoteachmehowtousethecomputer.(山东2006)a.thatb.itc.thisd.you,ii.单句改错下面的句子选自高考试题的改错部分，用你的火眼金睛把错误找出来吧！1.youwontfinddifficulttogettothecitycenter.(2004全国卷iv)2.iknowthereisnoteasytobeateacher.(湖北2004)3.thisisnotsurprisingthatthesilverghostwasregardedas“thebestcarintheworld”.,find后加it,thereit,thisit,seeyounexttime!,1.it指刚提到的事物，以避免重复:xianisabeautifulcity,isntit?2.也可以指动物、未知的人或婴儿:isthisyourdog？no,itisnt.,一、it作人称代词,二、it作非人称代词,it指天气、时间、日期、距离、价值、度量、温度、环境等，称为非人称的it：1.指天气：itisalovelyday,isntit?itisabitwindy.,七.it的一些习惯用法howisitwithyourstudy?学习好吗？thatsi