九年级英语上册 Unit 2《Topic 2 All these problems are very serious》Section B 课件 仁爱版.ppt

unit2 savingtheearth topic2 alltheseproblemsareveryserious sectionb teachingaimsanddemands 1 learnsomenewwordsandphrases sand cutdown changeinto prevent law prevent from humanbeing although turnoff2 learnsomeusefulsentences 1 icouldn tseeanything andmyfacehurtwhileiwaswalkingdownthestreetjustnow 2 passlawsagainstwaterpollution 3 remembertoturnthetapoffwhenyouleave 3 continuetolearntheindefinitepronounandadverb 4 learntotalkaboutpollutionanditsharm newwords 1alisten readandsay sandstorm kangkang mariaandjanearetalkinginaroom thewindoutsideisblowingstrongly kangkang whatbadweather thewindisblowingstronglywithlotsofsand icouldn tseeanything andmyfacehurtwhileiwaswalkingdownthestreetjustnow maria i msorrytohearthat butwhatcausesthesesandstorms jane peoplehavecutdowntoomanytrees asaresult alotofrichlandhaschangedintodesert maria that sbad buthowcanthataffecttheweather jane treescanstopthewindfromblowingtheearthaway kangkang andalotofwatercanbesavedbyforests jane theycanalsopreventthewaterfromwashingtheearthaway kangkang cuttingdowntreesisharmfultohumanbeings animalsandplants althoughwehavebuilt thegreatgreenwall westillneedtoworkhardtoprotecttheenvironment 1bworkalone read1aagain answerthequestions thenmakenotesaboutthefunctionsoftrees 1 whataretheytalkingabout 2 whatcausesthiskindofbadweather 1cgroupwork doyouknowhowsandstormscomeintobeing numberthepicturesandthentalkaboutthesandstormingroups 2groupwork readanddiscussdifferentwaysofprotectingandsavingwater explanation 1 thewindisblowingstronglywithlotsofsand 风中夹着大量的沙 疯狂地刮着 sand沙 沙子 不可数名词 如 muchsand许多沙agrainofsand一粒沙子 拓展 sand沙子如 childrenareplayingonthesand 孩子们正在沙滩上玩耍 2 peoplehavecutdowntoomanytrees 人们砍伐了太多的树 cutdown砍伐 down为副词 代词作宾语时 要放中间 如 treesareveryusefultous weshouldn tcutthemdown 树木对我们很有用 我们不应该砍伐它们 另外 cutdown还是 降低 减少 的意思 如 thearticleshouldbecutdownto1000words 这篇文章应该缩减到一千字 3 treescanstopthewindfromblowingtheearthaway 树能阻止风把土壤吹走 stop fromdoingsth 意为 阻止 做某事 相当于prevent fromdoingsth 和keep fromdoingsth 如 youcan tstopusfromgoingifwewantto 倘若我们要去 你是阻止不了的 4 andalotofwatercanbesavedbyforests 森林可以贮存大量的水分 besaved为被动语态结构 save此处为 贮存 保留 保存 的意思 save作动词时 还有 挽救 和 节约 的意思 如 it sadoctor sdutytosavepatients lives 挽救病人的生命是医生的职责 wemustsaveeverydropofwater 我们必须节约每一滴水 链接 5 cuttingdowntreesisharmfultohumanbeings animalsandplants 砍伐树木对人类 动物和植物是有害的 动名词短语cuttingdowntrees在句中作主语 如 watchingtvtoomuchisbadforyourhealth 看太多的电视对你的健康有害处 although用作从属连词 意为 尽管 虽然 但是 表示让步关系 although是用来引导让步状语从句的 特征词 如 althoughheisaboyofnineteenyearsold heknowsthreeforeignlanguages 6 althoughwehavebuilt thegreatgreenwall westillneedtoworkhardtoprotecttheenvironment although引导的让步状语从句较正式 多置于主句前 有时也可置于主句后 如 althoughtheyweretired theywentonworkinginthefield although表示 虽然 但是 它不能与but连用 在同一个句子中 用了although就不能再用but 正如用了because就不再用so一样 以避免重复 不过 although可与yet或still一起使用 如 althoughhelivesalone heishappy althoughhelivesalone yetheishappy helivesalone butheishappy 1 although相当于though 是从属连词 引导让步状语从句 在非正式语体中though使用较为普遍 但是它也不能与but连用 不过也可以同yet still连用 在倒装句中常用though 如 相关链接 youngthoughheis heisquiteexperienced 2 eventhough意为 虽然 即使 但是 相当于evenif though常与even连用 但although不能 exercises 1 idon twanttohavearest i mtired a becauseb althoughc butd so2 parentsshouldpreventthechildren takingmedicinebythemselves a aboutb withc fromd of3 neitherthegovernmentnoranyofficialis a bylawb underlawc abovethelawd obeythelaw c b c 单项选择 4 wewerequitetired westillwentonworking a although b because c because god although