外研版 (2019)选择性必修 第一册Unit 5 Revealing nature说课ppt课件

这是一份外研版 (2019)选择性必修 第一册Unit 5 Revealing nature说课ppt课件，共24页。PPT课件主要包含了had done，Usage等内容，欢迎下载使用。
1. At that time, peple believed that all species had appeared n Earth at the same time.2. Darwin suspected that the finches had evlved frm a cmmn ancestr.3. Many peple refused t believe that living things had evlved frm lwer frms f life.
Observatin 1
以上句子中，主句谓语动词用____________, 从句谓语动词用______________.两个谓语动词间的关系为______________________________________.
从句谓语动作先于主句谓语动作发生
结论：当动作发生在过去的过去，谓语动词用_________________.
Observatin 2
1. I had finished my hmewrk befre I had supper. 2. Jhn and Jane had nt knwn each ther fr a lng time befre they gt married. 3. The wrk had been finished by us by last Friday.
过去完成时的基本构成：主动式：否定式：被动式：
had nt/never dne
had been dne
1)表示在过去某个时间或动作之前已经完成或结束的动作。句中常有by、by the end f等介词(短语)和by the time、befre、when、until等引导的状语从句，也可以通过一个表示过去的动作或上下文来表示。
1. By eight 'clck last night, we had finished mst f the wrk.2. By the end f last week，they had finished the wrk.3. By the time he was 14, Mzart had cmpsed many pieces fr the harpsichrd, pian and vilin, as well as fr rchestras.4. Einstein had learned advanced maths befre he went t cllege.5. I fund the lecture hard t fllw because it had started when I arrived.6. I had waited until he finished his hmewrk.
2)用于宾语从句、状语从句和定语从句中。表示主句和从句发生的动作有先后关系，动作发生在前的，用过去完成时，动作发生在后的，用一般过去时。
1. She said that she had finished her hmewrk.2. During his stay in Xi’an, Jerry tried almst all the lcal fds that his friend had recmmended. 3. I didn’t g t see the mvie The Gld Rush because I had seen it twice.
3) hpe, mean, want, think, expect, plan, intend, suppse 等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……(但事实上并没有……)”。1. I had hped t send Peter a gift t cngratulate him n his marriage, but I culdn't manage it.2. I had meant t call n yu, but I had an unexpected visitr.3. They had wanted t help but culdn’t get here in time.4. We had intended t cme and see yu.
4) 在虚拟语气中，对过去事实的虚拟，从句谓语用过去完成时。
1. If he had seen yu yesterday, he wuld have asked yu abut it.2. If yu had cme earlier, yu wuld have met him．3. I wuld have called yu if I had knwn yur telephne number．
5) 常用过去完成时的固定句型：①在n 、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……”。1. I had n sner gt hme than it began t rain. (＝N sner had I gt hme than it began t rain.)2. I had hardly stepped int the classrm when the bell rang. (＝Hardly had I stepped int the classrm when the bell rang.)
②在“It was the ＋that...”句型中, 从句用过去完成时, 意为“那是第几次…”。 It was the first time that I had chatted nline in English.
③在“It was＋一段时间＋since 从句”句型中，从句用过去完成时，意为“自……发生以来已经多长时间了”。 It was at least three mnths since I had left Beijing.
Differences between past perfect, simple past tense and present perfect
1. 一般过去时侧重发生在过去的客观事实；而过去完成时强调动作发生在“过去的过去”，一定有一个表示过去的参照点。① I met her at the airprt yesterday. I hadn't seen her fr five years since she went abrad.② He nce wrked n a farm fr 10 years, and nw he is the manager f the cmpany.
2. 现在完成时与过去完成时的区别。现在完成时表示延续到现在或对现在有影响的动作，而过去完成时表示的是在过去某一事件发生之前已经完成或延续到过去某时的动作(句中有表示过去特定时间的状语)。1. I have learnt English fr 19 years.2. By 2015, I had learnt English fr 10 years.
Suggested answers:made up f cellsBricks that are used t build husesthirty trillinThirty-nine trillinhelp with digestinBreak dwn
In fact,…Speaking f which,…
① Tw species are mentined: the blue whale and the water bear. The blue whale is the largest animal species n Earth，which can grw up t almst 30 metres in length and weigh ver 130,000 kils. The water bear is prbably the tughest species，which can survive temperatures frm 150C t belw freezing -272℃.
The blue whale
The water bear
Language explratin
Suggested answers:1. is hme t2. are native t3. scientific4. Habitats5. ecsystem6. appearance7. primitive8. ancestr
Yak, lng-haired, shrt-legged xlike mammal that was prbably dmesticated in Tibet but has been intrduced wherever there are peple at altitudes f 4,000–6,000 metres (14,000–20,000 feet), mainly in China but als in Central Asia, Mnglia, and Nepal.
水杉（Metasequia glyptstrbides Hu & W. C. Cheng），杉科 [22]水杉属植物落叶乔木。其植株高大，树皮灰褐色，呈长条形，幼树树冠尖塔形，老树则为广圆头形；叶相对而生，叶色为绿，呈羽状，扁平且有绒毛；雌雄同株，球果 [26]，熟时深褐色；种子扁平，具窄翅；花期4-5月，球果10-11月成熟。 [11]因为水杉是可以在浅水中生长的大型乔木，所以叫做水杉。
1. (2023·新课标Ⅰ卷)When I finally finished the essay，the thught f winning ____________ (give) way t the enjyment f writing.2. (2022·全国乙卷)A few weeks befre，I ____________ (start) writing my term paper. I thught I culd finish it by August.3. (2022·新高考Ⅰ卷)I quickly searched the crwd fr the schl's cach and asked him what ________________(happen).4. I ____________ (hpe) t be back last night, but I didn't catch the train.5. It was the secnd time that Smith ____________ (visit) the Great Wall.6. By the end f last year, Henry ____________ (cllect) mre than a thusand pstcards.7. He ____________ (wrk) n a ship fr 8 years befre he ____________ (becme) the captain f the ship.8. When first cming t that city, my parents ften had a chat with neighburs, just as they ____________ (d) in ur hmetwn.9. His brther ____________ (be) the cnductr f the rchestra fr many years.10. All mrning as she waited fr the medical reprt frm the dctr, her nervusness ____________ (grw).