Unit4Savethetrees一、核心词汇1.savev.拯救2.pinen.松树3.discussv.讨论4.branchn.树枝5.rootn.根6.fightv.与……作斗争7.againstv.反对8.examplen.例子9.harmfuladj.有害的10.gasn.气体11.producev.产生12.oxygenn.氧气13.majoradj.主要的14.convenientadj.方便的15.furnituren.家具16.imaginev.想象17.diseasen.疾病18.digv.挖19.holen.洞20.carryv.搬21.containern.容器二、重点短语1.fightagainst对抗,与...作斗争2.helpsb.dosth.帮助某人做某事3.knowabout知道,了解4.inmanyways在很多方面,多角度5.takein吸收,理解6.comefrom来自(befrom)7.forexample例如8.infact事实上,确切地说9.lookaround环顾四周10.(be)madeof由……制成11.millionsof大量的12.(be)goodfor对……有好处三、基础知识点1.IfIplantthisseedintheground,willitbecomeapeartree,Hi?(1)if引导条件状语从句时,意为“如果”。主句(包括祈使句和含有情态动词can,may,must等的句子)用一般现在时,从句也用一般现在时;主句用过去时,从句也用过去的某种时态;如果主句是一般将来时,从句要用一般现在时表示将来。Eg:Wewillgooutifitisfinetomorrow.Youmustseeadoctorifyouareill.(2)a不定冠词,意为“一(个……)”,用在以辅音音素开头的单数可数名词前;在以元音音素开头的单数可数名词的前面要用不定冠词an。不定冠词a/an常放在单数可数名词前,表示一个不确定的事物或人。其用法如下:第一次提到某人或某物时,用不定冠词。Eg:You'dbettergotoseeadoctor.表示某一类中的任何一个,是泛指。Eg:Adogisausefulanimal.表示“一”的数量,但数的概念没有one强烈。Eg:Ihaveapen,apencilandtwobooks.用在表示时间、重量、速度、价格等名词前,意为“每一”。Eg:WehavesixEnglishclassesaweek.2.Lookaroundthisroom.与look相关的短语:lookfor寻找;lookover仔细检查,翻阅;lookafter照顾;lookup抬头看3.Alotoffurnitureismadeofwood.很多家具都是由木头制成的。(be)madeof(看得出原材料)=(be)madefrom(看不出原材料)意为“由...制成”。如:Thechairismadeofwood.这把椅子是由木头制成的。Paperisusuallymadefromwood.纸通常由木头制成。4.Butwecutdownmillionsoftreeseveryyear.但每年我们都会砍伐数百万的树木。millionsof意为“数以百万计;大量的”。如:MillionsofpeoplearoundtheworldlearnEnglish.全世界无数人在学习英语。→【拓展】:hundredsof数以百计的,成千上万的;thousandsof数以千记的,成千上万的;tensofthousandsof数以万计的;hundredsofthousandsof数以十万记的注意:hundred,thousand,million,billion等前面有具体的数词时,其后不加-s,也不带介词of。Eg:twohundred2005.Shecanskateataveryhighspeedbecauseshpractisesalot.Practise及物动词,意为“训练,练习”。宾语可以是名词、代词或动名词。Eg:YoumustpractisespeakingEnglisheveryday.6.Asaresult,thenumberofkindsofanimals,birds,insectsandtreesintheworldisdecreasing.Thenumberof意为“……的数量”。Eg:Thenumberofthestudentsinourclassis50.【拓展】Thenumberof……的数量后接复数名词,但谓语动词要用单数形式常跟large,small等词作表语Thenumberofthestudentsinourschoolis2000.Anumberof大量;许多,相当于many接复数名词作主语时,谓语动词用复数形式Number前可加small,large,huge等表示程度Anumberofstudentsareplayingfootball.7....butthespeakerdidnotstopspeakinguntiltwentypasttwelve.Not...Until...意为“直到……才……”。主句的动词一般是非延续性动词,它所表示的动作直到until所表示的时间才发生。Eg:Youcannotleaveuntilyourworkisfinished.四、语法:现在进行时(bedoing)1、现在进行时的语法功能1)表示说话时正在进行或发生的动作。这类情况常与now现在(atthepresent现在(atthemoment现在等时间状语连用。Pleasedon'tmakesomuchnoise.I'mwritingacomposition.不要吵闹。我正在写作文。Look!Theyarereadingoverthereunderthetree.看,他们在那边的树底下看书。Listen!Sheissingingintheroom.听,她在房间里唱歌。2)表示现阶段正在进行而说话时不一定在进行的动作。Weareworkinginafactorythesedays.这几天我们在一家工厂工作。这类情况常与today今天,thisweek这个星期,thisevening今天晚上,thesedays目前等时间状语连用。3)在口语中表示主语计划将要作的动作TheyareleavingforNewYorktomorrow.明天他们将要动身前往纽约。这类情况常与come来,go去,leave离开,depart离开,arrive到达,stay逗留,start开始等动词连用。所用的动词必须是动作而不是状态,主语必须是人。4)现在进行时与always等副词连用时带有感情色彩。He'salwaysquarrelingwithothers.他老喜欢跟别人吵架。与always总是,usually通常,continually不断的,constantly经常的,forever永远、老是等副词连用。5)有的现在进行时句子和一般现在时同义。用现在进行时表示问者的关切心情。Howareyoufeelingtoday?(Howdoyoufeeltoday?你今天感觉如何?Whyareyoulooking(doyoulook)sosad?为什么你看起来这么愁眉苦脸的样子呢?2、结构:be(am/is/are)+动词ing(现在分词)1)肯定句:主语+be+v-ing.+其他.如:Thechildrenareplayinginthepark.2)否定句:主语+be+not+v-ing.+其他.如:Iamnottalkingtoyou.3)一般疑问句:Be+主语+v-ing.+其它?如:Areyoutalkingtome?4)特殊疑问句:特殊疑问词+一般疑问句?如:Whoareyoutalkingto?3、动词ing现在分词的变化规则1)直接加ing:do-doingplay-playingcry-cryingfly-flyinggo-going2)双写最后一个辅音字母,再加ing:run-running,get-getting,let-letting,begin-beginning,put-putting,sit-sitting,swim-swimming,cut-cutting,shop-shopping,plan-planning.3)去掉最后一个不发音的e,再加ing:dance-dancing,wake-waking,take-taking,practice-practicing,write-writing,have-having4)改ie为y,再加ing:die(死亡)—dying,tie(系)—tyinglie(说谎)-lying4、【注意】表状态、感觉、情绪、精神活动的动词不可用于进行时如:believe(相信),doubt(怀疑),hear,know,understand,belong(属于),think(认为),look(看起来),show,mind,have,sound(听起来),taste(尝起来),care,like,hate,love,例如:Danny:Thedoorbellisringing.May:Iknow.Ihearit.【信息词】look,liste,now,Unit_4_save_the_trees_单元综合测试一、词汇(共20小题,每小题1分;满分20分)A)选择并抄写单词。1.Adoctor’sworkisto__________(save,kill)ourlives.2.A__________(pine,grass)isakindoftree.3.Treestakeinharmful_________(oxygen,gases).4.Busesmakeourlives_________(quickly,convenient).5.Iam________(read,reading).6.They’reimportantfighters_______(for,against)airpollution.7.The_______(furniture,furnitures)madeofwoodisveryexpensive.8.Mymotherbought_______(alive,living)fishtoday.9._______(Harmful,Harmless)gasesarebadforourhealth.10.Iwantto________(ask,discuss)thequestionwithyou.B)根据汉语提示,写出单词的正确形式11.Goodsoil(土地)will_________finecrops.(生产)12.Weknowthattreesdotwo_________thingstotheair.(主要的).13.Look!Heis_________theholesontheground.(挖).14.Which________(雨林)isthelargestintheworld?15.Therearemanykindsof_________(松树)inthispark.C)根据括号内所给词的适当形式填空16.Thistreehasgreen________allyearround.(leaf)17.Wecanlearnalotof________things.(use)18.Look!Thebus_________.(come)19.Treesarethebiggestandoldest________thingsontheearth.(live)20.Weshoulddosomeexercisetokeepus________.(health)二、单项填空(共15小题,每小题1分;满分15分)从A、B、C、D中选出可以填入空白处的最佳选项。()21.Wemustthanktrees____oxygeninto