ID: 24279360

Unit 9 Human Biology Section Ⅲ Grammar —— 完成时 课件(共45张)+学案(含答案)

日期:2026-03-04 科目:英语 类型:高中课件 查看:50次 大小:558609B 来源:二一课件通
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Unit,学案,45张,课件,完成时,Grammar
    Section Ⅲ Grammar ——— 完成时 ①Natural cloning has been going on for generations. ②Gardeners have been using a form of cloning when they take a cutting from a plant ... ③For years, there had been attempts to clone animals artificially. ④...cloning primates has been proved to be “much harder”, and doing so with non-reproductive cells ... ⑤Dr.Sun Qiang, director of the research team, said they had been wholly devoted to the research ... ⑥...and had been taking care of more than 1,000 monkeys 24 hours a day, 7 days a week ... 【我的发现】 1.句①②中黑体部分为         ,句④为现在完成时的      。 2.句③⑤中黑体部分为      ,句⑥为          。 一、现在完成时 1.构成和意义: have/has+done,表示过去所发生的动作或事情对现在造成的影响或结果。 2.用法 (1)表示发生在过去的动作或存在的状态到说话时刚刚完成或结束。现在完成时常与up to now, so far, already, yet, now, recently, in the past few years, just等表示时间的词连用。 In the past few years,great changes have taken place in my hometown. 在过去的几年里,我的家乡发生了巨大变化。 (2)下列情况下常用现在完成时: ①It is/has been+一段时间+since从句 ②This/That/It is the first/second/...time that+现在完成时 ③It/This is the best/worst/most interesting等+名词+从句+现在完成时 It is/has been twenty years since I last saw her. 我已经二十年没见她了。 This is the first time that we have seen a film in the cinema as a family. 这是我们全家第一次到电影院看电影。 This is the most interesting novel he has ever written. 这是他写得最有趣的一部小说。 名师点津 在条件、时间或让步状语从句中,表示将来某时之前已完成的动作。 When you have learned English,you will find it a bridge to so much knowledge. 当你学习英语之后,你将找到一条通往丰富知识的桥梁。 【即时演练1】 用所给动词的适当形式填空 ①—I remember you were a talented pianist at college.Can you play the piano for me? —Sorry,I           (not,play) the piano for years. ②—Look! Somebody          (clean) the sofa. —Well,it wasn’t me.I didn’t do it. ③This is the first time the company           (venture) into movie production. ④In order to find the missing child,villagers           (do) all they can over the past five hours. ⑤Recently,the CCTV and some TVs           (begin) to take some measures. 二、现在完成进行时 1.构成和意义:have/has+been+doing,现在完成进行时表示动作从过去某一时间开始,一直持续到现在,可能还要继续进行下去。 2.用法 (1)表示过去某一时刻发生的动作一直持续到现在,并有可能继续持续下去。 He has been playing computer games all day. 他一整天都在玩电脑游戏。 I have been working for this company for three years. 我在这个公司已工作三年了。 (2)表示一直到说话时为止的一段时间内一再重复发生的动作。 The teacher has been telling us to be careful all the term. 这个学期,老师一直在告诉我们要细心。 (3)表达较重的感彩。 You have been daydreaming but never make an effort. 你一直在做白日梦,但从不努力。 【即时演练2】 (1)补全句子 ①Tom   ... ...

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