高中英语外研版 (2019)选择性必修 第一册Unit 5 Revealing nature评课课件ppt

这是一份高中英语外研版 (2019)选择性必修 第一册Unit 5 Revealing nature评课课件ppt，共34页。PPT课件主要包含了 present， past，time，助动词，过去完成时，注意部分倒装，began，had led to，developed，First等内容，欢迎下载使用。

Unit 5Revealing nature
Past perfect
T understand the functin f the past perfectT learn the use f the past perfectT knw smething abut Lnesme Gerge
Lk at the sentences frm the reading passage and answer the questins.
Darwin suspected that the finches had evlved frm a cmmn ancestr, peple refused t believe that living things, including humans, had evlved frm lwer frms f life.
In sentence (a), which actin happened first, “suspected” r “evlved frm a cmmn ancestr”?2. In sentence (b), which actin happened first, “refused t believe” r “evlved frm lwer frms f life”?3. What des the structure had dne indicate?
In sentence (a), which actin happened first, “suspected” r “evlved frm a cmmn ancestr”? In sentence (a), “evlved frm a cmmn ancestr” happened first.2. In sentence (b), which actin happened first, “refused t believe” r “evlved frm lwer frms f life”? In sentence (b), “evlved frm lwer frms f life” happened first.
3. What des the structure had dne indicate? It indicates the actin happened befre a certain past actin.
Nw lk fr mre sentences with the past perfect tense in the reading passage, and summarise its use in yur wn wrds.
1. It was a yung man wh had left medical schl withut cmpleting his degree.2. What’s mre, he had recently received a letter frm his father predicting that he wuld be “a disgrace t yurself and all yur family”.3. After Darwin had spent sme time in Suth American, his rm n the ship was crwded with samples f the plants and animals he had cllected.
4. At that time, peple believed that all species had appeared n Earth at the same time, and had nt changed.5. It seems their beaks had evlved accrding t what fd was available n that particular island.6. Over time, it had slwly evlved int many new species.
We use the Past Perfect Tense t say that smething had already happened befre anther past actin r specific time in the past.
past perfect
the actin which ccurs previusly in time is expressed in the past perfect tense
the actin which ccurs later is expressed in the past tense
【构成】肯定式为“had +过去分词”否定式为“had nt +过去分词”思考：had在结构中的功能是什么？【用法】1. 表示在过去的某一时间或某一动作之前完成的动作或存在的状态，即“过去的过去”。 eg Befre we gt t the train statin, the train had already left. (我们到达火车站之前，火车就已经离开了。)
2. 表示从过去某一时间开始，一直延续到过去的另一个时间的动作，常用的时间状语有be then, by the end f, by the time. eg By the end f last term, we had learnt 2,000 English wrds. (到上学期期末为止，我们已经学习了2,000个英语单词了。) They had lived there fr ten years by then. (到那时为止，他们已经在那里住了10年了。)
3. 表示愿望、打算等的动词，如hpe，want，expect， think，mean，suppse，intend，plan等后接从句时，一般用过去完成时表示本打算实现而未实现的愿望和计划。 eg I had intended t meet him at the airprt, but I had an imprtant meeting t attend. (我本打算去机场接他，但是我有个重要的会议要参加。) I had hped t take a hliday this year but I was nt able t get away. (我原打算今年去度假，可是我离不开。)
4. 在句型hardly…when和n sner…than中，主句用过去完成时，从句用一般过去时，表示“一……就……”。 eg Hardly had I left when it began t rain. (我刚离开就开始下雨了。) N sner had he sat dwn than the telephne rang. (他刚坐下，电话铃就响了。)
5. 过去完成时还可用于一些固定句型：◆It / This / That was + the first / secnd ... + time + that从句，从句谓语常用过去完成时。 eg It was the first time that we had been t Chicag.◆It was + 一段时间+ since从句，从句谓语用过去完成时。 eg It was tw years since he had jined the army.
Supplementary explanatin
现在完成时与过去完成时的区别
eg We have lived here fr ten years. We had lived here fr ten years when we had t mve last year. I have learnt 2,000 English wrds s far. I had learnt 2,000 English wrds till then. Have yu read the newspaper tday? By the end f August, they had treated ver 5,000 patients.
一般过去时与过去完成时的区别
eg They had arrived at the statin by ten yesterday. They arrived at the statin at ten yesterday. He entered the rm, turned n the light and read an evening paper. She was very happy. Her whle family were pleased with her, t. She had just wn the first place in the cmpsitin cmpetitin.
Cmplete the paragraphs with the infrmatin frm the given sentences. The sentences are in the rder in which they happened. They can help yu t decide the use f tenses.
Yuan Lngping _________ t d research n hybrid rice because natural disasters __________ fd shrtages in the 1960s. In the end, he ___________ a better type f rice.
led t fd shrtage →began t d research →develped a better type
1. a Natural disasters led t fd shrtages in the 1960s. b Yuan Lngping began t d research n hybrid rice. c Yuan Lngping develped a better type f rice.
Gregr Mendel __________ study pea plants because their characteristics were easy t cntrl. By the time f his death in 1884, he _____________ imprtant discveries abut genetics.
2. a Gregr Mendel chse t study pea plants because their characteristics were easy t cntrl. b Gregr Mendel made imprtant discveries abut genetics. c Gregr Mendel died in 1884.
Cmplete the nline encyclpedia (百科全书）entry with the crrect frm f the wrds in the bx.
Lnesme Gerge
Befre cmpleting, view a traveler’s vlg t get sme infrmatin abut Pinta Island trtise.
cmpete decline eat live intrduce arrive
Lnesme GergeLnesme Gerge was the last Pinta Island trtise. He died in 2012. After Gerge’s death, the Pinta Island trtise was declared extinct.The extinctin f the Pinta Island trtise is blamed n humans. Befre humans 1_______ n the island, the species 2___________ in islatin and 3__________ the plants that naturally grew there.
Gerge was discvered many years after their arrival, and by then humans 4 ________________ new species that 5__________ fr the fd the trtises ate. After gats in particular had been brught t the island, the Pinta Island trtise ppulatin 6________. Eventually, nly Gerge remained.
had inrduced
Act ut a rle-play using the infrmatin in Activity 3. One f yu will play the keeper f Lnesme Gerge, and the ther will play the reprter asking abut Gerge. Use the past perfect tense where apprpriate.
根据句意，给出decline的意思。1) The sales declined.2) The first signs f ecnmic decline became visible.3) I invited her t jin us, but she declined.
1. decline v. : t decrease in quantity r imprtance 减少，降低 n. a decrease in the quality, quantity, r imprtance f smething 衰落，没落; 减少，削减
blame v. t say r think that sb r sth is respnsible fr sth bad 责怪，指责；把……归咎于
2. The extinctin f the Pinta Island trtise is blamed n humans.
eg I dn’t blame Jack fr the mistake. blame …fr 因…责怪 Whenever smething ges wrng, everyne blames it n me. blame …n 归咎于 Which driver was t blame fr the accident? be t blame 应受……的责怪（已经含有“受责怪”的意思，不用被动）
Last Sunday, I (1) _____________ (intend) t g fr an uting, but it (2)________(begin) t rain early in the mrning. S I went t the mvies with my by friend. By the time I (3)_______(get) up, my dg (4)___________(eat) all my breakfast n the table. Then I went t see the film, hungry, but when I (5) ________(arrive) at the cinema, the film (6)__________(be) n fr 20 minutes.
had intended
Fill in the blanks.
It was the first time that I (7)__________(see) a film with my by friend and it was the mst interesting mvie that I (8)____________ (watch)! Hardly (9)______I _______(get) ut f the cinema when I met sme friends. We had dinner and talked happily. But when I was ging t pay, I fund my wallet and mbile phne (10)______________(steal). What an unlucky day!
had watched
had gt
had been stlen
Hardly (1) ______I_____(get) up this mrning when I had a strange feeling that it wasn’t ging t be my day. I (2) ______________ (intend) t have a big breakfast, but I had n time. I gt up s late that I had t hurry t the bus stp t catch my bus. Unfrtunately, I (3)__________ (step) n a banana peel and fell n my backside.
had gt
had intended
What’s wrse, by the time I gt t the bus stp, the bus (4)_________(leave). I had n chice but t run. It was the first time that I (5)__________(run) t schl. When I gt t the classrm, I suddenly realized that it was Sunday. It is the wrst day that I (6)___________ (have) in the past few years.
Use the past perfect tense t write at least 5 sentences.