九年级英语全册 Unit 13 We’re trying to save the earth Period 2教学课件 （新版）人教新目标版.ppt

Weretryingtosavetheearth!,义务教育教科书（人教）九年级英语下册,Unit13,Period2SectionA3a-4c,鲨鱼早在恐龙出现前三亿年前就已经存在地球上，至今已超过四亿年，它们在近一亿年来几乎没有改变。鲨鱼是海洋中的庞然大物，所以号称“海中霸王”。,sharkfin,Maybyyoulikeit,Doyouknow?,中国目前是世界第一大鱼翅进口国，随着中国民众生活水平的提高，鱼翅已不再是少数人特享，而鱼翅被水银(mercury)污染的程度高达百分之七十，而且食用鱼翅正使全球鲨鱼种群遭遇绝灭之灾。渔民在捕捞上一条鲨鱼后不论大小，都会在甲板上用电锯活生生地把鲨鱼的背鳍(dorsalfin)、两个胸鳍(pectoralfin)和一部分尾鳍(tailfin)割掉，然后将全身血流不止的鲨鱼扔回海中.,因为鱼翅的价格甚高，近年吸引各地渔民争相在海中捕杀鲨鱼，引致海中生态出现不平衡，导致部分鲨鱼濒危。由此导致鲨鱼总数大幅减少50年来下降了80%。据估计，每年全球有1百万鲨鱼被捕杀，鱼翅的年产值达到12亿美金。消费者消费鱼翅的心理动机主要是“为了显示个人的品位或身份”、“高档次的鱼翅能给个人的事业或健康带来帮助”。,据中国海洋大学的鲨鱼鱼翅营养学报告和香港大学的危险的鱼翅汤中相关数据显示，从现代营养学的角度看，鱼翅并不含有任何人体健康有益或高价值的营养，鱼翅汤的美味主要来自它的配料，而并非鱼翅本身。该调查报告还显示出，鱼翅这种高档营养品被重金属毒素水银污染的程度很高，含有可被人体吸收的水银比率已超出正常允许含量的几十倍。因此，多吃鲨鱼肉、鱼翅都可能会对人体有很大伤害。,艾米护鲨俱乐部2011AmysSharkProtectionClub,保护鲨鱼拒食鱼翅,没有买卖就没有杀害,Savethesharks!,InsouthernChina.,Around70millionsharks,Over90percent,TheyareWildAidandtheWWF.,Soalthoughifbutwhen,ManypeopledonotrealizetheyarekillingawholeShark_theyenjoyabowlofsharksfinsoup.,2.Sharksareatthetopofthefoodchain,_iftheirnumbersdrop,theoceansecosystemwillbeindanger.3.Manythinkthatsharksaretoostrongtobeendangered,_theyrewrong.,when,so,but,4._therearenoscientificstudiestosupportthis,alotofpeoplebelievethatsharksfinsaregoodforhealth.5.Sharksmaydisappearoneday_wedonotdosomethingtostopthesaleofsharksfins.,Although,if,Interviewer:_youever_(take)partinanenvironmentalproject?Ken:Yes,Ihave.I_(help)withaClean-UpDaylastyear.Itwas_(consider)thebiggestclean-upprojectthiscity_ever_(have).Interviewer:Howmanypeople_(take)part?,Have,taken,helped,considered,had,had,took,Ken:I_(think)morethan1,000people_(come)tohelpout.Interviewer:Thatsfantastic!Iguesseveryoneinthiscityis_(try)toimprovetheenvironment.Ken:Yes,everyoneshould_(play)apartinkeepingthecityclean.,think,came,trying,play,canwouldcouldhavetoshouldmustmay/might,Whenitcomestosavingtheearth,people_thinkthatbigthings_bedone.However,manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,you_saveelectricitybyturningoffthelightswhenyouleavearoom.You_alsouse,paperorreusablebagsinsteadofplasticbags.Insomestores,younow_payforplasticbags.Ithinkthisisagreatidea.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.Allthesesmallthings_addupandbecomebigthingsthat_improvetheenvironment.Wecannotaffordtowaitanylongerbeforetakingaction!,PresentProgressivePresentSimple“usedto”+infinitivePresentPerfectPastprogressiveFuturesimplePassiveVoiceModelverbs,Whatafinedaytoday!Look!Whataretheydoing?,Lily,Lucy,1.现在进行时:PresentProgressive,概念:表示现在正在发生的动作结构:be(is,am,are)+doing标志语：Look!、Listen!、now,动词-ing形式的构成,Thetwins_(wash)theclothesnow.2.Look!He_(play)basketballoverthere.3.Listen!_Sally_(sing)?,arewashing,isplaying,Is,singing,Exercise,2.Howoftendoyou?(onceaweek,twice,never),Ihaveafriend.His/Hernameis.He/Sheplays.,一般现在时:PresentSimple概念:表示习惯、经常性的动作结构:do、does标志语：usually、often、never、sometimes、onceaweek、twiceamonth、everyyear,They_(wash)theclotheseveryday.2.Sometimeshe_(play)basketballoverthere.3.Howoften_Sally_(sing)?,washes,plays,Exercise,does,sing,-WhatdidyoudolastSundaymorning?-Iwentto.,3.一般过去时,LastSundaymorning,myfriend.Intheafternoon,he/she.Andatnight,he/she,一般过去时:PastSimple概念:表示过去发生的动作结构:did标志语：yesterday、.ago、in1992、lastweek/month,动词-ed形式的构成：,-Haveyoupackedyet?-Yes,Ihavepacked.No,Ihavent,4.现在完成时,现在完成时:PresentPerfect概念:表示已经发生的动作结构:hasdone、havedone标志语：already、yet、ever、never、since、for,不规则过去分词,不规则过去分词,5.过去进行时:PastProgressive概念:表示过去正在发生的动作结构:be(was，were)+doing标志语：at8:00yesterday、when、while、,6.一般将来时:FutureSimple概念:表示将要发生的动作结构:willdo、shalldo、be(is/am/are)goingtodo标志语：tomorrow、in.、next,概念:表示主语是动作的承受者,即行为动作的对象的一种语态。结构:be+动词过去分词e.g.In1972,itwasdiscoveredthattheywereendangeredOurclassroomiscleanedeveryday,7.Passivevoice,1.can,could(1)表示能力，“能，会”Canyouplaybasketball?(2)表示怀疑、猜测，常用于否定句和疑问句中Hecantbeinclassroom.(3)表示请求或允许，口语，“可以”相当mayYoucangonow.,(4)could是can的过去式，可以表示过去的能力IcouldswimwhenIwassevenyearsold.(5)can开头的一般疑问句以can和cant回答could开头的一般疑问句以could和couldnt回答,(4)否定句中，mustnt表示禁止，“不允许”Must开头的疑问句，肯定回答用must，否定回答用neednt（=donthaveto）“不需要，不必”,4.need（1）need+todo：need为实义动词，用助动词提问或否定（2）need+doing：表被动意义（3）need+do：need为情态动词，用need提问或回答，肯定回答用need，否定回答用neednt,5.hadbetter“hadbetter+动词原形”：最好做某事，否定形式用：hadbetternotdo,6.shall(should),will(would)(1)shall用于第一人称征求意见、询问。(2)should常用来表示义务、责任Weshouldobeytrafficlaws.(3)will用于第二人称表示询问，请求，可也以表达现在的“意愿”Willyoupassmethebook？Wewilldoanythingforyou.,(4)would用于表示过去的意愿或委婉提问Wouldyoutellmethewaytothestation?,1.can和beableto表示能力时用法相同Can：一般现在时、一般过去时（could）Beableto：现在时、过去时、将来时JimcouldntspeakChineselastyear,butnowhecan.Wewillbeabletocomebacknextweek.,2.can和may表示可能性时的区别(1)肯定句中用may表示可能Youhadbetteraskthepoliceman.Hemayknow.(2)否定句中，语气肯定，“不可能”用cant语气不肯定，“可能不”用maynot,3.would,should,could,might等过去式有时不表示过去，而是表示更委婉的语气,4.must,have(has)to都是“必须”的意思，常可互换使用，但,have(has)to是用于强调客观需要，“必须，不得不”Must用于强调主观看法，“必须，应该”,5.maybe和maybemay情态动词，后面+动词原形be，用在句中maybe副词，“大概，也许”相当于perhaps，用于句首,6.cant和mustnt否定推测：cant“不可能”mustnt“禁止，不允许”，不能用于推测must肯定句中表推测，“一定”,Thetwins_(wash)theclothesforanhour.He_(play)basketballsincethreeyearsago.Howlong_Sally_(sing)yet?,havewashed,hasplayed,Exercise,has,sung,Iusually_upat6:00,butyesterdayI_upat7:00,andtomorrowI_(get)upat6:30.2.Listen!Someone_(knock)atthedoor.3.I_(be)inBeijingfortwoyears.4.Howoften_Andy_(surf)theInternet?,get,got,willget,isknocking,havebeen,does,Exercise,surf,5.Hefellasleepwhilehe_(read)abook.6.I_never_（hear)ofthatmanbefore.7.Mybrotheroften_(go)forwalkslastsummer.8._thestory_(happen)inLondonin1940?,wasreading,have,went,heard,Did,happen,9.What_he_(do)whenhismotheropene