【精品】高中英语（人教大纲）第二册下：Unit18 Inventions(备课资料)VIP免费

ReferenceforTeachingⅠ.异域风情Everycountryhasapostalsystem,buttheserviceandspeedofmaildeliveryvary(不同的).TheAmericanpostalserviceisverygood,thoughitisslowerthanpostalserviceinsomecountriessuchasBritain.MostdevelopedWesterncountrieshavefastandreliablemaildelivery,butsomecountrieshavebeentroubledbylaborstrikesthatdelayeddeliveriesforweeksormonths.Canadausedtohavesuchstrikes,buthasnothadapostalworkers’strikeformanyyears.StrikesalsohavebeenaprobleminItaly,AustraliaandFrance.Insomecountries,stampshaveoccasionallybeenpeeledoff(撕掉)fromlettersandsoldtostampcollectorsbeforetheselettersreachtheirintendedrecipients.Traditionalpostalserviceisbeingchallengedbymoderntechnology.Insteadofbuyingstampsandenvelopesforsendingletters,manypeoplenowusefaxmachinesandE-mailsystems.Thesenewmethodsofcommunicationarealotfasterandarebecomingcheaper.IntheU.S.,manybusinessesuseprivatemailservicesfordeliveryofexpressmailandpackages.ManynewfirmsthatofferexpressmailserviceorspecialdeliveryservicehavestartedtooperateinChina.Someofthesefirmsarepartoftheexistingpostalsystem;othersarenotattached(隶属)tothesystemandoperateinconjunctionwithorindependentlyfromthepostalsystem.Ⅱ.知识归纳1.it的用法it作代词，常见用法如下：(1)指天气，时间，距离等Itiscoldtoday.今天天气冷。（指天气）It’sgettingcolderandcolderdaybyday.天气一天天变冷了。（指天气）What’sthedatetoday?It’stheeleventh,October.今天几号了？10月11号。（指日期）It’stimetogotobed.是睡觉的时间了。（指时间）Itwastwelveo’clockalready.已经十二点了。（指时间）Howfarisitfromyourschooltothebusstop?从你们学校到公共汽车站有多远？（指距离）Itisautumnnow.现在是秋天了。（指季节）Itisquiethereinthepark.公园里很安静。（指环境）（2）指代刚提到过的东西（可指具体的东西，也可指抽象的东西）Myfatherboughtmeanewbikeanditcostusfourhundredyuan.我父亲给我买了辆新自行车，花了我们400元。—Iwanttostay.我想留下来。—Yourfatherwon’tlikeit.172你父亲不会喜欢你这样的。YougavemealotofhelpwhenIwasinBeijing.AndIwillnotforgetit.在北京你帮了我很大的忙，我是永远忘不了这件事的。（3）作形式主语，代替不定式，动名词或从句Itisimportanttomasteraforeignlanguage.=Tomasteraforeignlanguageisimportant.掌握外语是重要的。Itisnousesayinganymoreaboutit.=Sayinganymoreaboutitisnouse.关于这件事再多说也无用。Itwon’tmakeanydifferenceyourbeinghere.=Yourbeingherewon’tmakeanydifference.你在不在这里都一样。Itissaidthatheisathief.=Thatheisathiefissaid.据说他是个小偷。Itisstrangehowlittleheknowsaboutthis.关于这件事他知道这样少真是奇怪。Itismyfaultthishashappened.发生了这件事是我的错。（有时可省略that）（4）作形式宾语，代替不定式，动名词，从句Ifounditdifficulttopersuadehimtostopsmoking.我发现说服他戒烟很困难。Doyouthinkitrightwastingyourtime?你认为浪费你的时间对吗？Hekeptitasecretthathisfatherhaddied.他不告诉别人他父亲已经去世了。（5）用于强调句中ItwasyesterdaythatImetherinthestreet.我是昨天在街上碰到她的。Itisyouthat/whoarewrong.是你错了。IthinkitwasJacksaidthis.我认为是杰克说过这件事。（who或that也可省去）Whatisityouwantmetodo?你是想让我做什么？（it后省去了that）（6）作不定的形式主语Whoisitthere?It’sI(me/you/he…).那是谁呀？是我（你/他……）。IthoughtitwasMary,butitwasnotshe.我还认为是玛丽，但不是她。（7）it还有下列用法①用在一些词组中，it没有特别的意思Thelasttrain’sgone.Comeon,we’llfootit.173最后一趟火车已经开走了。来，咱们步行吧。②有时泛指一般情况Howisitgoing?情况怎样？It’syourturntobeonduty.轮到你值...