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

we retryingtosavetheearth 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2011amy ssharkprotectionclub 保护鲨鱼拒食鱼翅 没有买卖就没有杀害 savethesharks insouthernchina around70millionsharks over90percent theyarewildaidandthewwf soalthoughifbutwhen manypeopledonotrealizetheyarekillingawholeshark theyenjoyabowlofshark sfinsoup 2 sharksareatthetopofthefoodchain iftheirnumbersdrop theocean secosystemwillbeindanger 3 manythinkthatsharksaretoostrongtobeendangered they rewrong when so but 4 therearenoscientificstudiestosupportthis alotofpeoplebelievethatshark sfinsaregoodforhealth 5 sharksmaydisappearoneday wedonotdosomethingtostopthesaleofshark sfins 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 that sfantastic 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 ifit sfar 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 haveyoupacked yet yes ihavepacked no ihaven t 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 itwasdiscoveredthattheywereendangered ourclassroomiscleanedeveryday 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hecan tbeinclassroom 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can t回答could开头的一般疑问句以could和couldn t回答 4 否定句中 mustn t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needn t don thaveto 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needn t 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jimcouldn tspeakchineselastyear 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can t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 can t和mustn t否定推测 can t 不可能 mustn t 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 whenhismotheropen