人教版新目标英语八年级下册人教版新目标英语八年级下册人教版新目标英语八年级下册人教版新目标英语八年级下册Unit8Unit8the number of 表示表示特指特指问问“.的数量的数量”Thenumberofwomeninmyofficeis20.a number of = a lot ofA number of letters are from single parents. (许多信来自单身父母。)拓展延伸拓展延伸smalllarge / greatpopulation单数单数小结：小结：I.单项选择单项选择1.Thenumberofpeopleinthecity_aboutsevenmillionnow.A.areB.hasC.is2.Anumberofvisitors_visitingtheWestLakeandthenumberofthevisitors_increasing.A.are;isB.is;areC.are;are课堂练习课堂练习现在完成时的定义、标志词现在完成时的定义、标志词一、定义一、定义现在完成时现在完成时I have been a teacher for two years.I have lived in China since I was born.持续持续性性表示从过去开始一直表示从过去开始一直持续持续到现在的动作或状态。到现在的动作或状态。影响影响性性I have already had lunch.(I am not hungry.)我已经吃过午饭了。(现在不饿了。)表示过去已经发生的动作对现在造成某种表示过去已经发生的动作对现在造成某种影响影响。一、定义一、定义现在完成时现在完成时I have read this novel twice.I have never read this novel.频率频率性性一、定义一、定义现在完成时现在完成时表示到目前为止动作发生的表示到目前为止动作发生的次数次数持续持续性性二、标志词二、标志词现在完成时现在完成时for+时间段时间段since+过去的时间点，意为过去的时间点，意为自从自从。I havent seen him since 1999.I have studied English for six yearssince+从句（一般过去时）从句（一般过去时）Tom has taught here since he graduated.Have you cleaned the room yet?影响影响性性二、标志词二、标志词现在完成时现在完成时already，意为已经We have already finished our homework.just,意为刚刚I have just had breakfast.yet,意为还(用于疑问句和否定句)They havent decided yet.Mary has read the book twice。现在完成时现在完成时二、标志词二、标志词频率频率性性 ever,意为意为“曾经曾经”never,意为意为从来没有从来没有twice,many times等等Have you ever cooked at home？I have never seen such a good film.经典例题经典例题1.Lily is my classmate. We each other since she came to our school.A. know B. knew C. have known D. will know解题思路题目中标志词为_，考查 ( 现在完成时/一般过去时) , 故选_.sinceC_经典例题经典例题2.I the film yet. A. have seen B. havent seen C. didnt see D. wont see解题思路题目中标志词为_,考查 ( 一般过去时/现在完成时) , 故排除_；yet通常用于_句和_ 句中,故题目中句子应为(肯定句/否定句) ,意为:我还没有看过这部电影，故选_yet_C 、D否定句疑问句_B经典例题经典例题3. Ice Age is a very nice film and I _it twice.A. will see B. seeC. would see D. have seen解题思路题意表明:冰河世纪2是一部很好的电影,我(到目前为止)看了两次了。题目中标志词为_,考查(现在完成时/ 一般将来时) , 故选_。twice_D经典例题经典例题4 Miss Brown, we _ cleaning our classroom. Can we go home now?A. finish B. has finishedC. are finishing D. have finished解题思路题意表明:布朗老师,我们打扫完教室了。现在可以回家了吗?题中无明显标志词，但强调打扫完教室对现在造成的_ ，故用(现在进行时/现在完成时)，故排除_, 且we后用（have/has）故选_。影响影响_A C _D总结总结一、定义持续持续性性影响影响性性频率频率性性二、标志词for,since,already,just,yet,ever,never,twice.表示到目前为止动作发生的表示到目前为止动作发生的次数次数表示过去已经发生的动作对现在造成某种表示过去已经发生的动作对现在造成某种影响影响。表示从过去开始一直表示从过去开始一直持续持续到现在的动作或状态。到现在的动作或状态。Thank you!