Unit 9 Section Ⅲ Grammar(课件PPT)-【精讲精练】2024-2025学年高中英语选择性必修第三册（北师大版2019）

Section Ⅲ　Grammar 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 语法精讲 技能培养 01 课时作业 知能达标 03 随堂演练 巩固提升 02 栏目导航 UNIT 9　HUMAN BIOLOGY 1 01 语法精讲 技能培养 栏目导航 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 02 随堂演练 巩固提升 栏目导航 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 栏目导航 UNIT 9　HUMAN BIOLOGY 1 03 课时作业 知能达标 点击进入Word 栏目导航 栏目导航 UNIT 9　HUMAN BIOLOGY 1 谢谢观看 栏目导航 UNIT 9　HUMAN BIOLOGY 1 完成时 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。 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。 [即学活用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　haven't played　(not，play) the piano for years. ②Look! Somebody　has cleaned　(clean) the sofa. —Well，it wasn't me.I didn't do it. ③This is the first time the company　has ventured　(venture) into movie production. ④In order to find the missing child，villagers　have done　(do) all they can over the past five hours. ⑤Recently，the CCTV and some TVs　have begun　(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)表达较重的感情色彩。 You have been daydreaming but never make an effort. 你一直在做白日梦，但从不努力。 [即学活用2]　补全句子/用所给动词的适当形式填空 ①Tom　has been working hard　(一直在努力学习)since the new term began. ②I　have been playing football　(一直在踢足球)all the morning，so I'm sweating heavily. ③I　have been working　(work) in this school since I graduated from college.Now I am still working here. ④You know，I　have been looking　(look) for a job for three months，and this is my first formal interview. 三、现在完成进行时和现在完成时的区别 1．现在完成进行时强调动作的延续性；而现在完成时强调的是某个刚刚完成的动作，或某个过去的动作对现在的影响或产生的结果。 I have been thinking it over. 我一直在仔细考虑。(延续性) I have thought it over. 我已经仔细考虑过这件事了。 2．现在完成进行时可以表示动作的反复性；现在完成时一般不表示动作的反复性。 Have you been meeting him recently? 你最近经常见到他吗？(反复性) Have you met him recently? 你最近见过他吗？ 3．现在完成进行时有时含有某种感情色彩；现在完成时一般表示平铺直叙。 I have been waiting for you for two hours. 我一直等了你两个小时。(表示不满) I have waited for you for two hours. 我已经等了你两个小时。 [即学活用3]　补全句子 ①He　has developed a good habit　(养成了好习惯)of independent learning.No wonder he ranks first in every exam in his class. ②Now that Lucy is out of work，she　has been considering going back　(一直考虑回去) to school，but she　hasn't decided　(未决定)yet. 四、过去完成时 1．构成和意义：had＋done，过去完成时的基本用法与现在完成时相似，所不同的是：现在完成时的动作需在现在以前完成，过去完成时的动作需在过去某一时间以前完成，也就是说动作发生在“过去的过去”。 2．用法 (1)表示在过去某个时间或动作之前就已经发生的动作，通常简称为“过去的过去”。句中常有by，by the end of等介词(短语)和by the time，before，when，until等引导的状语从句。 —Did you have difficulty finding Ann's house? ——你们找到安的家有困难吗？ —Not really.She had given us clear directions and we were able to find it easily. ——算不上难。她已经给了我们她家的具体的位置，我们能够容易地找到它。 By the end of 2020，he had collected more than a thousand foreign stamps. 到2020年底，他已经收集了1 000多枚外国邮票。 (2)过去完成时表示发生在过去某个动作或时刻之前的动作一直延续到过去的另一个时间，常与for，since等词连用。 I had been at the bus stop for 20 minutes when a bus finally came. 我在车站等了20分钟才来了一辆公交车。 (3)过去完成时在几个重点句型中的应用 ①在no sooner...than，hardly...when句型中，主句用过去完成时，从句用一般过去时。意为“一……就；刚……就”。 I had hardly stepped into the classroom when the bell rang. 我一踏入教室的门，铃就响了。 No sooner had I got home than it began to rain. 我刚到家就开始下雨了。 ②在“It was the first/second/...time that...”句型中，that从句的谓语动词用过去完成时。 It was the first time that I had chatted online in English. 那是我第一次用英语在网上聊天。 ③It was＋一段时间＋since从句(从句用过去完成时) It was at least three months since I had left Beijing. 我离开北京至少有3个月了。 ④主句(过去完成时)＋ by the time＋表示过去的从句 By the time I got to the station，the train had already gone. 我到车站时，火车已经开走了。 ⑤表示“意愿、打算”的动词如hope，mean, want，think，expect，plan，intend等的过去完成时表示“原本……(但事实上并没有……)”之意。 I had hoped to be back last night，but I didn't catch the train. 我本来希望昨晚回来的，但我没赶上火车。 [即学活用4]　单句语法填空 ①Helen　had left　(leave) her keys in the office so she had to wait until her husband came back home. ②By the time I left the school，he　had taught　(teach) the class for 3 years. ③She asked me whether I　had returned　(return) the books to the library，and I admitted that I hadn't. ④—Did you have to do much for the dinner party? —Helen　had finished　(finish) everything by the time I got home. ⑤It was the second time that he　had rushed　(rush) out of the classroom without permission. 五、过去完成进行时 1．构成和意义：had been＋动词­ing，表示过去某一时间之前一直进行的动作。 2．用法 (1)过去完成进行时表示动作在过去某一时间之前开始，一直延续到这一过去时间。和过去完成时一样，过去完成进行时也必须以某一过去时间为前提。 I had been looking for it for days before I found it. 这东西我找了好多天才找到的。 (2)表示反复进行的动作。 He had been mentioning your name to me. 他过去多次向我提到过你的名字。 [即学活用5]　单句语法填空 ①They　had been expecting　(expect) the anecdote for some time before I came. ②The doctor asked what he　had been eating　(eat). ③She came back at seven.He　had been waiting　(wait) for her for 2 hours. ④We didn't go shopping yesterday because it　had been raining　(rain) all day. ⑤When Alice came to，she did not know how long she　had been lying　(lie) there. 六、过去完成时和过去完成进行时的区别 1．过去完成时 表示动作在过去的某一时间已经完成。 Tom was disappointed that most of the guests had left when he arrived at the party. 当汤姆到达晚会的时候，大部分人都走了，他很失望。 2．过去完成进行时 表示在过去某一特定时间以前发生的动作一直持续到这个特定时间，或是刚刚结束，或是还要延续。但是，决不会延续到现在。 It had been raining hard for three weeks.Nearly all the little trees on the mountain were washed away. 大雨一连下了三个星期，山上的小树几乎都给冲走了。 [即学活用6]　补全句子 ①She　had been studying English　before she entered the college. 她上大学以前一直在学英语。 ②She　had cleaned the office　，so it was very tidy. 她已经打扫过了，所以办公室很整洁。 ③The heavy rain　has been pouring for about two days　and it may lead to a big flood. 大雨已连续下了大约两天，这有可能造成洪灾。 ④I heard　you'd been looking for me　. 我听说你一直在找我。 Ⅰ.用所给动词的适当形式填空 1．Its success is very encouraging in today's television world where reality shows　have played　(play) a leading part so far. 2．Tom was shocked to realize that the two­month summer vacation　had passed　(pass) before he knew it. 3．Facial recognition technology　has been extended　(extend) into many areas of school life so far. 4．This is the first time she has experienced (experience) disappointment. 5．By the end of last term，more than 3，000 English words　had been learnt　(learn) by us. 6．It was really annoying; I couldn't get access to the data bank you　had recommended　(recommend). 7．I　had been studying　(study) at home before my mother came back. 8．He　has been coughing　(cough) a lot recently.He ought to give up smoking and go to see a doctor. 9．He　has been listening　(listen) to English programs since he came to the US，so he　has made　(make) great progress. 10．A rescue worker risked his life saving two tourists who　had been trapped　(trap) in the mountains for two days. Ⅱ.用括号中所给单词的适当形式填空 1．Doctors　have discovered several variations　of the virus so far. 到目前为止，医生们已经发现了几种这种病毒的变体。 2．I like dancing and I　have been taking dancing lessons　in my spare time for many years. 我喜欢跳舞，多年来我一直在业余时间上舞蹈课。 3．In fact，your parents　had forgiven you for your mistakes　before you apologized. 事实上，在你道歉之前，你的父母已经原谅了你的错误。 4．My parents　had been arguing about something　emotionally before I came back. 在我回来之前，我的父母一直在激动地争论着什么。 5．By the end of this term，we　will have learned about 3，000 English words　. 到这学期结束时，我们将学会大约3 000个英语单词。 $$