高中英语课件-it的用法

Goodmorning,everyone!①Itisnevertoooldtolearn.②Itiseasiertofallthantorise.③Itisnousecryingoverspilt(溢出的)milk.④Itneverrainsbutitpours(泼水).Proverbs(谚语)with“It”活到老,学到老。摔倒容易爬起来难。覆水难收。不鸣则已,一鸣惊人。⑤Itiseasytoopenashopbuthardtokeepitalwaysopen.⑥Ittakesthreegenerations(代,辈)tomakeagentleman.创业容易守业难。十年树木，百年树人。Grammar:Useof“It”2020/6/24课文原句再现1.It’sabeautifuldayhereandIamsittingunderthebigtreeattheendofthegarden.2.Yourmothertellsmethatyoustartedsmokingsometimeagoandnowyouarefindingitdifficulttogiveitup.3.Believeme,Iknowhoweasyitistobeginsmokingandhowtoughitistostop.Theuseof“it”1.用作人称代词，代表前面提到的人或事物。1)Who’sit?_________me.2)Lookatthepicture._____isapictureofourschool.It’sIt2.用于代替指示代词this和that。---Isthisjacketyours?---Yes,______is.itReadandanalyzethefollowingsentences.•ItisFridaytoday.•ItwasverycoldlastMonday.•Itisabout8:30now.•Itisabout25kmfromLongxiantoBazi.•ItliesinthesouthofShaoguancity.•Itis40°C!Yougotahighfever!Conclusion:it可以用作非人称代词，表示_____,_____,______,______,______,_____等。DateweathertimedistanceplaceTemperature日期天气时间距离地点温度e.g:______a.Jimisatthedoor．____wantstoseeyou．b.Someoneisatthedoor．____mustbeJim．A.That,ItB.It,HeC.He,ItD.Who,He一般说来，在指代身份或性别明确的人时，通常要根据情况用代词he／she；若是指代身份或性别不明的人，则用代词itBackC1.Ican’tfindmypen.I’mgoingtobuy_____.2.Lifetodayisbetterthan______intheolddays.3.Ican’tfindmypen.Imusthavelost_____._____用来指代前面提到的可数名词，所指的是事物本身；______则用来替代前面出现过的可数名词，泛指，指一类事物中的一个.______用来代替不可数名词或单数可数名词，特指。onethatititonethat一.It作为形式主语当不定式、动名词、从句等用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it.2020/6/24eg:1.Itisillegal（forateenager）todriveacarwithoutalicense.2.Itisnecessaryforyoutogivehimaletter.Conclusion：在句1和句2中it的作用是___________,真正主语是________。形式主语不定式短语（1）It+be+adj.+（forsb.）todosth.此处adj.通常为描述事件的形容词：easy，difficult，hard，necessary，impossible，likely，right，wrong，important，obvious，useful，useless，dangerous…2020/6/24（2）It+be+adj+ofsb.todosth此处adj.通常为描述人的形容词：kind，unkind，nice，rude，cruel，considerate，careless，foolish，stupid，wise，crazy.eg:1.It‘skindofyoutohelpmewiththeproblem.某人做某事某人是…….2It’sfoolishofyoutoquityourjobnow.2020/6/243.Itisnogoodcryingoverspiltmilk.4.Itisnousecastingpearlsbeforeswine.在句3与句4中，it的作用是_________,真正主语是____________.形式主语动名词短语构成如下结构：Itis+nouse/nogood/notanygood/notanyuse+doingsth.Readandanalyzethefollowingsentences.•Itisobviousthatthewaterwastoblame.•Isitpossiblethathewillbecomethechairmanofourcountry?•ItisamazingthatatmyageIstilllooklikeastudent!•Analysis：it是______,句子真正的主语是——____________形式主语that引导的主语从句Conclusion：Itis+____+that从句adj.跟踪训练1：Itis+adj.+that从句•很明显他已经知道了那个坏消息。•姚明篮球比易建联打得好是肯定的。Itisobviousthathehasknownthebadnews.ItiscertainthatYaomingplaysbasketballbetterthanYijianlian.Itissaidthat…据说……Itisreportedthat…Itissupposedthat…Itishopedthat…Itiswellknownthat…据报导……据推测……希望……众所周知……普遍认为……有人建议……Itissaid(reported....)that...Itissuggestedthat…Itisgenerallyconsideredthat…该句型中的it仍是形式主语，真正主语是that引导的主语从句。1.吸烟危害健康，这是事实。2.碰巧我们在同一间大学。3.据说日本发生了地震。4.有人建议他应该立刻戒烟。Itisafactthatsmokingdoesharmtohealth.Ithappensthatweareinthesamecollege.__________thereisanearthquakeinJapan.Itissaidthat________________heshouldquitsmokingatonce.Itissuggestedthat二、it作形式宾语1.IfounditveryinterestingtostudyEnglish.我发现学英语非常有趣。2.Ithinkitnousearguingwithhim.我认为和他争吵没有用。3.Hemadeitclearthathewasnotinterestedinthissubject.他非常清楚地表示他对那门学科不感兴趣。小结：it在句中充当_________，真正宾语可以由______以及_________短语充当。还可以由______引导的宾语从句充当。不定式动名词that形式宾语总结：当复合宾语中的宾语是不定式、动名词宾语从句时,往往把真正的宾语放在它的补足语后面，而用it作形式宾语,放在宾语补足语之前。该句型中的it作形式宾语,常用的动词有think,believe,make,find,consider,feel等。在一些固定用法中考查常见的固定用法有:makeitforgetitbelieveitornotDon’tmentionitItdoesn’tmatterIt(That)dependsGotitIt’shardtosayIt’suptoyoutodosth.takeit/thingseasy成功，做到，赶上等别提了，忘了它吧信不信由你别提了，表示不用谢没关系视情况而定明白了，懂了很难说由你来决定做某事不要慌，别担心，沉住气Rewritethesentencesusingan“it”structure.•1Givingupsmokingisdifficult.(Itis…)•2Mostpeoplebelievesmokingcausescancer.(Itisbelievethat…)•3Don’ttrytoquitonastressfulday.(It’snouse…)•4youcouldsufferfrombadhealthifyoukeepsmoking.(Itislikelythat…)Itisdifficulttogiveupsmoking.Itisbelievedthatsmokingcausescancer.Itisnousetryingtoquitonsastressfulday.Itislikelythatyoucouldsufferfrombadhealthifyoukeepsmoking.Onemidnight,wasrainingheavily.Marywaslyinginbed.Shecouldn'tfallsleep.Suddenly,sheheardsomeoneknockingatthedoor.“Whois?”Sheasked.Shelookedattheclockhungonthewall.wasstrikingtwo.“isme.”Onemananswered.“wasimpossibleforhimtoappearhere.”shethought.“John?Is__you?”“Yeah!isme”themananswered.Sherushedtoopenthedoor.Johnwasjuststandinginfrontofher.HesaidtoMaryexcitedly,“Imissedtheplane.wassaidthattheplaneIwouldtakecrasheddownthreehoursago.ItwasinthatplaneIshouldhavegonetoNewYork.Afterthis,IthinkclearlythatIloveyousomuchIwanttobemarryyou.”ititItItItItItitthatthat/whichthatthat1.是到戒烟的时候了。(quit)Itistimetoquitsmoking.2.让人惊讶的是在我这个年纪我依然这么健康。(Itisamazingthat...)ItisamazingthatatmyageIamstillsofit.ItseemsstrangethatthemanwhohaddelevopedcommunismshouldhavelivedanddiedinLondon.3.一旦你吸烟上了瘾,你会发现要把它戒掉很难。(addict...to;tough)Onceyouareaddictedtosmoking,youwillfindittoughtogiveitup.4.这似乎是一件怪事：这位发展了共产主义的人竟然在伦敦生活过，并且在伦敦去世。5.I(认为有必要)totakeplentyofhotwatereveryday.(think)6.