人教版八年级下册英语u.ppt

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1、collect shellmarathonpairskatesinceHilltop schoolraiseseveralskater收集；搜集贝壳；壳马拉松赛跑；马拉式活动一对；一双溜冰鞋自从；自以来山顶学校筹集；筹募几个的；数个的溜冰者have/has是助动词是助动词 been是是be的过去分的过去分词词表示从过去开始一直持续到现在的动作，表示从过去开始一直持续到现在的动作，并有可能持续下去并有可能持续下去 时态现在完成进行时时态现在完成进行时（一）构成形式：构成形式：have/has been+Ving for+一段时间一段时间have/has been+doing sth+since+

2、过去的时间点过去的时间点 since+从句从句(一般过去时一般过去时)与过去时的比较：与过去时的比较：1.I watched TV for three hours.我看了三小时的电视我看了三小时的电视（我现在没有看电视了）（我现在没有看电视了）2.I have been watching TV for three hours.我看了三小时的电视我看了三小时的电视（我现在仍然在看电视）（我现在仍然在看电视）例句例句 1 1我已经学了年的英语了我已经学了年的英语了I have been learning English for 5 years.例句例句 2 2他已经集邮他已经集邮1010年了年了H

3、e has been collecting stamps for 10 years.He has been collecting stamps since 10 years ago.He has been collecting stamps since 2002.画线部分提问：画线部分提问：How long has he been collecting stamps?引导时间的介词引导时间的介词forfor与与sincesince的区别的区别forsince表示时间的持续表示时间的持续for+for+时间段时间段表示表示“自从过去某一自从过去某一时间点以来时间点以来”since+since+过

4、去的过去的时间点时间点强调一段时间强调一段时间强调动作或状态强调动作或状态一直延续到现在一直延续到现在(for与与since引导的短语用引导的短语用how long提问提问)从句从句forfive minutesten days five yearssinceMay 1,20038:00he was seven years oldseven years agoI started teaching English in 2010.I am still teaching English now.How long have you been teaching English?I have been

5、teaching English for 2 years.Teach English2010Have been teaching Englishnow2 yearsTeach English24 years old(Since I was 24.)sam started skating at 9 am.He is still skating now.How long has he been skating?He has been skating for 4 hours.skate9 a.mHave been skatingnow 1 p.m 4 hoursskate(since 9 ocloc

6、k.)Mary started cleaning at 7a.m.She is still cleaning now.How long has she been cleaning?She has been cleaning for 30 minutes.clean7a.mHave been cleaning7:30 a.m30 minutesclean run 30 minutes 4 hours3 hours 2 hours 1 hourA:How long has he/she been?B:He/she has been.for Linda play soccer 45 minutes

7、Harry Tom Play piano Alice Play computer Alan Watch TV Jim rideSam Lu Ning Li Chen To raise money for charity 4 hours4 hours1 hourRead 3a and then fill in the blanks.Im talking to you from the Hilltop School Skating Marathon.Here,students are skating to raise money for charity.For every hour they sk

8、ate,each student raises ten yuan for charity.The skating marathon has been going for five hours now,and several skaters are still skating.Alison was the first one to start,and has been skating for the whole five hours.Next is Sam,and he has been skating for four hours.Lu Ning has been skating for fo

9、ur hours too,and Li Chen just started an hour ago.1b.Listen.A reporter is talking to the participants in a skating marathon.Fill in the chart below.Alison SamVictorCeliaIve been skating for five hours.I skated for two hours.How long hasbeen skating?He/She has been skating forHow long did skate?He/Sh

10、e skated for2a Listen to the interview with the skating marathon winner and check the questions you hear.I.Write the questions:1_He has been standing there for four hours.2_I have been riding a bike since I was ten years old.3_She has been walking for five hours.4._Ive been watching TV since 7:00.5._Hes been waiting for the train for an hour.