Keep-the-Candle-BurningLook-into-Science!省公开课一等奖新名.pptx

Keep the Candle Burning Lesson 26 Look into Science Unit 5第1页 同学们，上一课学习单词你们都掌握了吗？现在大同学们，上一课学习单词你们都掌握了吗？现在大家来检验一下，点击下面音频开始听写吧！家来检验一下，点击下面音频开始听写吧！第2页Do you like doing science experiments?Why or why not?第3页 THINK ABOUT ITTHINK ABOUT ITDo you like doing science experiments?Why or why not?What will happen if you put a jar upside down over a burning candle?Can you see the candle holder in this picture?The candle is pink.The candle holder is grey.The candle holder is“holding”the candle!第4页Science is so interesting!Im sure youll like this experiment!What do you need?a candlea candle holder a big glass jara shallow dishsome watera lighter or matches第5页What do you do?1Put the candle in the candle holder.2Put the candle holder on the dish.3Fill the dish half full with water.4Light the candle.5Let the candle burn for two or three minutes.6Carefully put the jar over the candle until the top of the jar rests on the dish.7Examine the water in the jar.What can you see?第6页What is happening?As the candle burns，it uses the oxygen in the air.When the candle stops burning，it has used up all the oxygen in the air.The water inside the jar rises.How far does the water rise?Because about one fifth of the air is made up of oxygen，the water rises and fills about one fifth of the jar.Can you do this experiment?10第7页keep/kip/v.保持保持 eg：You should keep the room clean.你应该保持房间清洁。讲解来自讲解来自点拨点拨知识点1 1第8页keep宾语形容词，意为“使保持某种状态”。You cant sneeze and keep your eyes open at the same time.你不能在打喷嚏同时让你眼睛睁着。keep sb.from doing sth.阻止某人做某事，相当于“stop sb.from doing sth.”。We should keep the children from swimming alone in the sea.我们应该阻止孩子们单独在海里游泳。keep(on)doing sth.继续，重复做某事。Keep smiling!保持微笑！讲解来自讲解来自点拨点拨考向keep使用方法：使用方法：第9页 match/mt/n.火柴，比赛火柴，比赛 v.相当，相配相当，相配 讲解来自讲解来自点拨点拨知识点2 2eg：We need to light a match.我们需关键点一根火柴。They beat us last time，but we hope to win the next match.上次他们打败了我们，但我们希望赢得下 次比赛。The picture matches the story.这幅图和故事相配。第10页 考向 match作名词时，为可数名词，复数为作名词时，为可数名词，复数为matches。eg：Dont strike matches if you smell gas.假如你闻到煤气味，就不要划火柴。讲解来自讲解来自点拨点拨第11页 half/hf/adj.二分之一二分之一 n.半；半；二分二分之一之一 考向一讲解来自讲解来自点拨点拨知识点3 3eg：Given half a chance,he will succeed.只须给他一点儿机会，他就会成功。half 意为意为“二分之一二分之一”，作形容词。，作形容词。half an/a 名词，意为名词，意为“半个半个”。eg：half an hour 半个小时 half a day 半天 half an apple 半个苹果第12页half of意为意为“二分之一二分之一”，后接名词时，后接名词时，普通要在名词前加普通要在名词前加thethe、形容词性物主代词或指、形容词性物主代词或指示代词等。此结构作主语时谓语动词和示代词等。此结构作主语时谓语动词和of后名词后名词保持一致。即：若保持一致。即：若of后名词是复数则谓语动词用后名词是复数则谓语动词用复数形式；若复数形式；若of后名词是可数名词单数或不可数后名词是可数名词单数或不可数名词，则谓语动词用单数形式。名词，则谓语动词用单数形式。考向二讲解来自讲解来自点拨点拨第13页典例典例 Half of the books _ for students.AisBare Cam Dwas【点拨点拨】考查主谓一致。采取考查主谓一致。采取主谓一致法主谓一致法。句意为：二分。句意为：二分之一之一 书是给学生。书是给学生。half of the books 意为：二分之一书，所意为：二分之一书，所 以谓语动词用复数以谓语动词用复数are。B讲解来自讲解来自点拨点拨第14页light/lat/v.点燃点燃 讲解来自讲解来自点拨点拨知识点4 4eg：Will you light the fire for me，please?请为我把火点燃，行吗？第15页词性 含义 例句 n.可意为“光线，电灯”。作“光线”讲时为不可数名词，作“电灯”讲时为可数名词。The light was beginning to fail.天色渐暗。Dont forget to turn off the lights when you leave.当你离开时候不要忘了关灯。adj.意为“浅色，轻”。Rose likes the light green skirt.罗丝喜欢那条浅绿色短裙。You can carry this bag.Its very light.你能够拿这个包。它很轻。讲解来自讲解来自点拨点拨考向light其它使用方法：其它使用方法：第16页 until/ntl/conj.直到直到为止为止 讲解来自讲解来自点拨点拨知识点5 5eg：Im going to stay here until Saturday and start on Sunday.我打算在这里一直呆到星期六，然后星期 日出发。第17页 考向二用于否定句中，主句谓语动词普通是用于否定句中，主句谓语动词普通是非延续性。非延续性。eg：I didnt begin the work until he came back.直到他回来我才开始这项工作。考向一用于必定句中，主句谓语动词普通是延用于必定句中，主句谓语动词普通是延续性。续性。讲解来自讲解来自点拨点拨第18页典例典例I didnt go to bed _ my mother came back home last night.(青海)AsinceBuntilCwhen【点拨点拨】句意：昨天晚上直到妈妈回家我才睡觉。表示句意：昨天晚上直到妈妈回家我才睡觉。表示“直到直到才才”，应使用，应使用notuntil，故选，故选B。B讲解来自讲解来自点拨点拨第19页 as/z/conj.当当时；伴随时；伴随 adv.如同如同 prep.作为；作为；如同如同考向一讲解来自讲解来自点拨点拨知识点6 6as可作连词，意为可作连词，意为“伴随，当伴随，当时时”。eg：As time went by,the environment got worse and worse.伴随时间推移，环境变得越来越糟了。第20页 考向二辨析辨析while，when与与as：while 表示“在时候，在期间”。它强调主句动作与从句动作同时发生或主句动作发生在从句动作进行过程中。while从句中谓语动词必须是延续性动词。when 表示“当时候”。从句中谓语动词既可用延续性动词，又可用非延续性动词，这些动词既能够表示动作，又能够表示状态。也就是既能够指较短时间(即某一详细时间)，也能够指一段时间。主句和从句动作能够同时发生，也能够先后发生。as 与以上两词同义，常可与when或while通用，但它着重指主句和从句动作同时发生，不是一前一后。所以，还可意为“一边一边”。讲解来自讲解来自点拨点拨第21页典例典例 _Betty came home yesterday evening,the children were watching TV.AWhileBAs soon asCWhen DWhenever【点拨点拨】考查连词使用方法。考查连词使用方法。while“当当时，在时，在期期 间间”，引导时间状语从句，从句中谓语动词必须是延，引导时间状语从句，从句中谓语动词必须是延 续性动词；续性动词；when“当当时候时候”，引导时间状语从，引导时间状语从 句，从句中谓语动词既可用延续性动词，也可用非延句，从句中谓语动词既可用延续性动词，也可用非延 续性动词；续性动词；as soon as“一一就就”；whenever“不论何不论何 时时”。依据句意。依据句意“当贝蒂昨天晚上回到家时候，孩子当贝蒂昨天晚上回到家时候，孩子 们正在看电视。们正在看电视。”可知选可知选C。C讲解来自讲解来自点拨点拨第22页 stop/stp/v.停顿停顿 考向一【易错点易错点】讲解来自讲解来自点拨点拨知识点7 7eg:They stop listening to music.他们停顿听音乐。辨析辨析stop doing sth.与与stop to do sth.stop doing sth.停顿正在做事，doing sth.作宾语。stop to do sth.停下(正在做事)去做另一件事，to do sth.作目标状语。第23页eg：Stop talking，please.请停顿说话。They stop to talk.他们停下来说话。考向二stop sb.(from)doing sth.阻止某人做某事。阻止某人做某事。eg：We stop the boys(from)climbing the tree.我们阻止男孩们爬树。讲解来自讲解来自点拨点拨第24页典例典例You look tired.Youd better _ a good rest.(山东烟台)Astop to have Bstop havingCto stop to have Dto stop having【点拨点拨】句意：你看起来很累。你最好停下来去好好休息句意：你看起来很累。你最好停下来去好好休息 一下。一下。had better后面用动词原形，意思是后面用动词原形，意思是“最好最好”。stop to do sth.表示停下来去做另一件事，不定式表目标；表示停下来去做另一件事，不定式表目标；stop doing sth.表示停顿正在做事情。这里应该是指停下表示停顿正在做事情。这里应该是指停下来去好好休息。故选来去好好休息。故选A。A讲解来自讲解来自点拨点拨第25页 use up 用完，用光用完，用光 讲解来自讲解来自点拨点拨知识点8 8eg：He has used up all his money.他已经用光了他全部钱。第26页 cut up 切碎 He cut up the meat.他把肉切碎了。eat up 吃完 Eat up your lunch.吃完你午饭。give up 放弃 Dont give up and you will succeed.别放弃，你会成功。讲解来自讲解来自点拨点拨考向与与up相关短语：相关短语：第27页典例典例Clean Plate Campaign(光盘行动)calls on Chinese people to _ all the food each meal.Aeat up Buse upCpick up Dcut up【点拨点拨】考查动词短语辨析。句意：光盘行动号召中国人考查动词短语辨析。句意：光盘行动号召中国人 民每餐吃完全部食物。民每餐吃完全部食物。eat up“吃完吃完”符合句意。符合句意。use up“用完，用尽用完，用尽”；pick up“捡起捡起”；cut up“切碎切碎”均与均与句意不符。句意不符。A讲解来自讲解来自点拨点拨第28页how far 多远多远 考向一讲解来自讲解来自点拨点拨知识点9 9用于问询两地间距离，答语也要用表示距用于问询两地间距离，答语也要用表示距离句子。离句子。eg：How far is it to your house from here?It is about 5 minutes walk.从这儿到你家有多远？大约步行5分钟旅程。第29页 考向二【易混点易混点】和和how搭配疑问短语还有：搭配疑问短语还有：how much 问询价格以及不可数名词数量。How much is the meat？肉多少钱？How much water do you want？你想要多少水？how many 问询可数名词数量。How many stamps have you collected？你已经搜集多少张邮票了？how old 问询年纪。How old is your sister？你妹妹多大了？She is seventeen.她十七了。讲解来自讲解来自点拨点拨第30页how long 问询多长时间或物体长度。How long do you spend on your homework？你花多长时间在你家庭作业上？Only an hour.仅仅一个小时。how often 问询某种行为或动作发生频率。How often do you visit your parents？你多久去探望一次你父母？Once a week.一周一次。how soon 问询多久以后。How soon will the play start？这部戏剧将什么时候开始？In ten minutes.十分钟后。讲解来自讲解来自点拨点拨第31页典例典例_is it from the village to your farm?About 10 minutes walk.(广东)AHow often BHow soonCHow long DHow far【点拨点拨】考查疑问短语辨析。采取考查疑问短语辨析。采取逻辑推理法逻辑推理法。how often多久一次；多久一次；how soon多久以后；多久以后；how long多长；多长；how far多多远，对距离提问。由句意远，对距离提问。由句意“从村庄到你农场有多远？从村庄到你农场有多远？”“”“大约步行大约步行1010分钟旅程。分钟旅程。”可知选可知选D。D讲解来自讲解来自点拨点拨第32页one fifth 五分之一五分之一 考向【难点难点】讲解来自讲解来自点拨点拨知识点 分分数数表表示示形形式式：分分子子用用基基数数词词表表示示，分分母母用用序序数数词词表表示示，当当分分子子大大于于1 1时时要要把把分分母母加加s。注注意意：分分数数作作主主语语时时，谓谓语语动动词词单单复复数数形形式式取取决决于其后名词。于其后名词。10第33页eg：There are two hundred teachers in our school and three fourths of them are women teachers.我们学校有200名教师，四分之三是女教师。Two thirds of the students are boys in our class.我们班三分之二学生是男孩。Two thirds of the area is under water.三分之二面积在水下。讲解来自讲解来自点拨点拨第34页典例典例About _ of the students like keeping diaries in English in our class.(贵州安顺)Atwo fifthBtwo fifthsCsecond five Dtwo five【点拨点拨】句意：在我们班大约五分之二学生喜欢用英语记句意：在我们班大约五分之二学生喜欢用英语记日志。本题考查分数表示方式。分数表示形式是：分子用日志。本题考查分数表示方式。分数表示形式是：分子用基数词，分母用序数词。当分子大于基数词，分母用序数词。当分子大于1 1时候，分母要加时候，分母要加s。“五分之二五分之二”应该是应该是 two fifths，故选，故选B。B讲解来自讲解来自点拨点拨第35页in front of 在在前面前面 讲解来自讲解来自点拨点拨知识点eg：There is a big tree in front of the classroom.在教室前面有一棵大树。1111第36页in front of 在(外部)前面 Li Ming sits in front of Danny.李明坐在丹尼前面。in the front of 在(内部)前面 The driver sits in the front of the bus.司机坐在公共汽车前部。考向 辨析辨析 in front of与与in the front of讲解来自讲解来自点拨点拨第37页1.Read the lesson and fill in the blanks.Lets do the experiment together!Put the candle in the candle holder.Put the candle holder on the dish.Fill the dish half full with water.Light the candle with a_ or a lighter.What can you see?The candle is burning._the candle burn for two or three minutes.Then carefully put the jar over it until the top of the jar rests on the dish.As the candle burns，it _the oxygen in the air.match Let uses Lets Do It!第38页When the candle stops_，it has used up all the oxygen in the air.The water inside the jar _ and fills about _ of the jar.This is because about one fifth of the air is made up of oxygen.burning rises one fifth 第39页2.Circle the correct words to complete the sentences.1Dont(use up/push up)all of the ink.Leave some for me.2The medical team(is made of/is made up of)five experienced doctors.3Please fill the hole(with/in)sand and water.4They didnt realize their mistake(until/as)we told them.5My brother wasnt(strong enough/enough strong)to lift the box.Lets Do It!第40页PROJECTSCIENCE？THATS INTERESTING!Read about the experiment in this lesson.With a group of classmates，practice the experiment.Do your experiment in front of the class.Dont forget the following things：11 First，describe your experiment.Second，ask the class what they think will happen.Third，do the experiment.Finally，ask the class if the result is what they expected.Lets Do It!第41页一、依据汉语提醒完成句子一、依据汉语提醒完成句子1Please pass me a _(浅)dish.2I need some _(火柴)to light the candles.3There is onefifth _(氧气)in the air.4After finishing all your work，you should _ (检验)it carefully.5We have _(用完)our salt.来自来自点拨训练点拨训练shallow matches oxygen examine used up 第42页来自来自点拨训练点拨训练二、单项选择二、单项选择6Jim _all his money to buy the computer.Afixed up Bused up Cate up DGot7Have you finished the work?Not yet，but no matter how hard it is，well keep_ until we finish it.Afailed Btrying Ctried DfailingBB第43页来自来自点拨训练点拨训练8Dad，why should I stop _ computer games?For your health,my boy.Ato play Bplaying CPlay Dplayed9(中考安徽)Mrs.King put a coat _ the sleeping girl to keep her warm.Aover Bwith Cbehind Dbeside10(中考安顺)About _of the students like keeping diaries in English in our class.Atwo fifth Btwo fifths Csecond five Dtwo fiveBBA第44页来自来自点拨训练点拨训练三、连词成句三、连词成句11should，the，keep，clean，bedroom，we(.)_12nations,up,our,made,country,is,of,56(.)_ 13far，water，rise，how，does，the(？)_14sure，will，the，pass，exam，you，Im(.)_15.is,beautiful,lighter,your,expensive,and,how(！)_How beautiful and expensive your lighter is!Our country is made up of 56 nations.We should keep the bedroom clean.How far does the water rise?Im sure you will pass the exam.第45页 本节课主要学习了以下重点内容本节课主要学习了以下重点内容:（1 1）重点单词：）重点单词：keep，match，half，light，until，as,stop等。等。（2 2）重点短语：）重点短语：use up,how far,one fifth等。等。第46页1.熟记本课时词汇熟记本课时词汇 2.完成本课时课后作完成本课时课后作业业 课后作业课后作业第47页