Unit6HowlonghaveyoubeencollectingshellsSectionA(1a-2c)【重难点预测】1.现在完成时态的构成及用法。2.have/hasbeenandhave/hasgone的区别。【新知导学】1.—WhendidyoustartlearningEnglish?—IstartedlearningEnglishtwoyearsago.2.—Howlongdidyousleeplastnight?—Islept8hourslastnight.【自主预习】1.请同学们先认真阅读学习目标，然后仔细研读课本P44-P45,看完后将所学到的东西进行归纳，画出重要知识点，用红色笔作好疑难标记。2.试着读一读单词表中本课时的新单词（或词组），将不会的单词圈出来，然后通过听磁带或求助于其他等方式将单词读准、读熟。3.你知道下列单词的意思吗？试试看！collect_________shell___________marathon______pair___________skate__________since___________been___________4.写出下列短语的意思。sinceIwas7yearsold___________________________forfiveyears__________________apairofskates__________________________________yourfirstskatingmarathon_______5.课前听一听，完成课本P44-451b,2a,2b的听力。【合作探究】任务1：模仿对话，区分现在完成进行时与一般过去时。成龙（JackieChan）1954:beborn1961~now:actA：WhendidJackieChanbegintoact?B:Whenhewas7yearsold.A:HowlonghasJackieChanbeenacting?B1:Hehasbeenactingsince1961.B2:Hehasbeenactingfor51years.B3:Hehasbeenactingsincehewas7yearsold.任务2：新知讲解。归纳生成，你能归纳上面B1-B3主要表达哪种时态吗？这种时态的结构怎样？在什么情况下使用？和一般过去时有什么区分吗？和小组成员讨论一下，然后派代表在班内汇报。(可以查阅资料)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________任务3：做一个调查。听力之后，小组合作完成一个调查。调查组员最喜欢哪种运动？从什么时候开始？得了多久？然后把调查结果向全班汇报。可用下列句型：Whendidyoustarttolearn…?Howlonghaveyoubeendoing….?Istartedtolearn…whenIwas…Ihavebeendoing….for/since…____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________考点聚焦◆现在完成进行时：表示从过去某一时间开始一直持续到现在的动作。这一动作可能刚刚开始，也可能仍在继续，并可能持续到将来。由“have/hasbeen+doing”构成。练一练：翻译1.他滑了两小时冰啦。_______________________________________________________________________________2.孩子们从八点钟开始就一直在看电视。_______________________________________________________________________________3.我学英语学了五年。_______________________________________________________________________________◆for和since的区分：for+时间段，since+过去的时间点，since+时间段+ago，since+从句它们都用于完成时中。练一练：用for或since填空1.TheyhavebeenlearningChinese_____theycametoChina.2.Ihaven’tseenher_____alongtime.3.Hehasbeenlivinghere_____2001.4.Shehasbeendoingherhomework_____twohours.5.It’s5years_____weleftschool.6.—HowlonghasMarybeenateacher?—_____twoyearsago.【学案整理】____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Unit6Howlonghaveyoubeencollectingshells?SectionA(1a–2c)练一练：1.Hehasbeenskatingfortwohours.2.ChildrenhavebeenwatchingTVsince8o’clock.3.IhavebeenlearningEnglishforfiveyears.练一练：1.since2.for3.since4.for5.since6.since
