Unit9Whenwasitinvented?Period2Step1Warm-up1.Greetings.2.revision:Showsomepicturesofinventionsandtalkaboutthem.A:WhatisitinEnglish?B:It’s…A:Whenwasitinvented?B:Itwasinvented…A:Whatisitusedfor?B:Itisusedfor…Step2practice1.Learnnewwords:useful,annoyingAskstudentstogivesomeexamplestoshowwhateachwordmeans.Forexample,Avacuumcleanerishelpful.Averyloudtruckisannoying.2.Pairwork3a.Makealistoffivehelpfulinventionsandfiveannoyinginventions.Thenteachercanaskstudentstotellthereasons.T:Isthelightbulbusefulorannoying?S1:Ithinkit’suseful.T:Whyisit?S1:Well,itgivespeoplemoretimetoworkandplayeveryday.3b.Discusstheopinionsaboutsomeinventionswiththepartnerlikethis:A:Whatdoyouthinkisthemosthelpfulinvention?B:Ithinkthemosthelpfulinventionisthelightbulb.A:Whyisthat?B:Well,itgivespeoplemoretimetoworkandplayeveryday.Step3ConsolidationandExtensionGroupwork4Imaginethatyouarealoneonatinyisland.Choosefiveinventionsyouwouldliketohaveontheislandwithyou.Tellthegroupwhatyouchoseandwhy.Maybeyoucanusethefollowingdrills.I’dliketohavea…becauseIcould…It’susedfor…Ithinkthemosthelpfulinventionis…Butthat’snotgoinghelpyouleavetheisland.Ithinkitwouldbebettertoleave…Step4ExercisesFillintheblankswiththewordsgiven:1.Thework_______(finish)tomorrowmorning.2.Thebooksmust______(give)backontime.3.Ithinkthetelephone_____(invent)in1876.4.Teamay_______(invent)byaccident.5.Theruler_____(use)sinceIbeganmyschoollife.6.Thebikesareusedfor_____(ride)on.Step5SumupGooverthewholelessons.Step6Homework1、句型转换。（1）Shewasseentocomeoutofthelibrarybyhim.(变为主动语态)Heoutofthelibrary.（2）Whenaretreesoftenplanted?(变为主动主态)Whenpeopleoften?（3）TheLeaguefoundedinGuangzhouin1992.(就画线部分提问)theLeague?（4）Didthestudentsweartheschoolclothesalot?(变为被动语态)thescloolclothesalot?（5）Katetookgoodcareofthebabyyesterdayevening.(变为被动语态)ThebabywellbyKateyesterdayevening.（6）Hisauntboughthimabicycle.(变为被动语态)Abicyclehimbyhisaunt.2、汉译英。（1）计算机是何时发明的？（2）谁发明了计算机？（3）计算机是用来做什么？（4）你认为什么是最有用的发明？（5）它能够给人们更多时间工