青少版新概念3AUnit 2.ppt

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1、3AUnit2howmanypoundshasthefatmanlost?仔细观察红色部分ShehasbeentoJapan.ShehasdrunkChineseblacktea.Ihavesungkalaoka.Ihaveeatensnails.has/have+动词过去分词Thinkaboutit.....1.现在完成时2.结构：have/has+动词的过去分词e.g.Ihavehadasandwich.3.现在完成时用法1）表示：2）表示：4.改否定：改一般疑问：Let’stakealookatgramma

2、r.找一找属于那种用法1.Ihavejustdonemyhomework.2.Ithasrainedsincelastnight.3.Wehaven’tseenherforages.4.Hassheevervisitedyou?5.Havetheyfinishedtheirworkyet?（2）现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用.①for+时段②since+过去一个时间点（译为：自从…

3、…以来）③since+时段+ago④since+从句（过去时）⑤Itis+时段+since+从句（过去时）Maryhasbeenillforthreedays.Ihavelivedheresince1998.四．现在完成时的标志1.　现在完成时的含义之一是过去完成的动作对现在仍有影响,用以下四大标志词可以表达这种含义:*以already,just和yet为标志　　Hehasalreadygotherhelp.他已得到她的帮助。Hehasjustseenthefilm.他刚刚看过这场电影。Hehasn‘tco

4、mebackyet.他还没有回来。试一试下列动词。。。work____________live____________stay____________drop____________clean____________study____________试一试下列动词。。。work_worked__worked_live_lived__lived_stay_stayed__stayed_drop_dropped__dropped_clean_cleaned__cleaned_study_studied__studie

5、d_⑴AAA型（动词原形与过去式、过去分词同形）let（让）let      letput（放）put      putread（读）read     readbeat（动）beat     beatcost（花)costcost             cut（割）cutcut(4)ABB型（过去式与过去分词同形）dig（挖）dug      dugget（得到）got      gothang（吊死）hanged  hangedhang（悬挂）hung    hunghold（抓住）held

6、      heldshine（照耀）shone  shonesit（坐）sat       satwin（赢）won      wonmeet（遇见）met      met(5)ABC型begin（开始）began begundrink（喝）drank     drunkring（铃响）rangrungsing（唱）sang   sungswim（游泳）swamswumblow（吹）blewblowndo（做）diddonego（去）wentgonelie（平躺）laylainsee（

7、看见）sawseenwear（穿）worewornbe(am,is,are)was/werebeenlose_______draw_________hear________sell________stand________take________have________do________see________think________lose_______draw_________hear________sell________stand________take________have________do_

8、_______see________think________lostlostdrewdrawnheardheardsoldsoldstoodstoodtooktakenhadhaddiddonesawseenthoughtthoughtWherehaveyoubeen?flightn.空中旅行seatn.座位frontrow前排middlerow中排backrow后排s