甘肃省景泰县五佛中学八年级英语 unit 4 lesson 30 keep the candle burning课件 冀教版

Lesson 30 Keep the Candle Burning! Keep the Candle Burning! . Learning aims: 知识目标 Master the new words: match, light, burn, use up, shallow, candleholder, oxygen,one-fifth 2) The important sentences: Fill the dish half full of water. As the candle burns, it uses up oxygen in the air. There is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar. . 教学重点：1. Describe and explain the experiment in English. 2.分数的表达法 .教学难点:Describe and explain the experiment in English. 能力目标 ：can describe and explain the experiment in English 情感目标：Cultivate the spirit of loving science. 预习早知道 1.match (pl)-_ light (过去式）_(过去分词） _ burn（过去式）_ (过去分词） _ v. 燃烧 use up one-fifth shallow(反义词）_ half(pl)_ matches lighted/litlighted/lit v. 点燃;使燃烧/照亮;使光明 burned/t 用完；用光； 五分之一 burned/t deep halves Watch ,Say,answer and Fill First. _the candle _the candleholder. Then. _the candleholder _the dish. Third. _the dish _water . Fourth. _the candle . Fifth. _the candle _for two minutes . Sixth.carefully_the jar_the candle until the top of the jar_on the dish. What observation can you make? How do we do the experiment put putin in Fillhalf full of Light let burn putover rests Lets do it! Come on !Lets do it! Come on ! Step 1.Step 1. Put Put the candle the candle in in the the candleholder.candleholder. Step 2.Step 2. PutPut the candleholder the candleholder inin the dish the dish Step 3.Step 3. Fill Fill the dish half full of the dish half full of water.water. stepssteps Steps: Step 5.Step 5. Let the candle burn for Let the candle burn for two or two or three minutesthree minutes Step 6Step 6. Carefully put jar . Carefully put jar over over the candle until the top of the the candle until the top of the jar rests on the dish jar rests on the dish Step 4. Step 4. LightLight the candle. the candle. Think ,Read and Anwser 1. Why did the candle stop burning ? because there was _oxygen in the jar . 2. Why did the water rise ? The force outside the jar is _ than the force inside the jar . 3. How far did the water rise ? Why? It rose about _of the jar . Because there is one-fifth oxygen in the_. no stronger one-fifth air Lets practice- Come on !Lets practice- Come on ! Who can read them?Who can read them? Lets practice- Come on !Lets practice- Come on ! Who can read them?Who can read them? Who can do the experiment?Who can do the experiment? 1. use up 用尽，用光 use up the oxygen 用光氧气 It has used up all the oxygen in the air. 它已用光了空气中所有的 氧气。 eat up drink up eat up drink up 2.one-fifth 五分之一 one-fifth oxygen 五分之一的氧气 one-fifth of the jar 罐子的五分之一 one-second one-second one-third one-third Read them loudly-You can do it! 3.burn v. 燃烧 stop burningstop burning 停止燃烧停止燃烧 make the candle burnmake the candle burn 使蜡烛燃烧使蜡烛燃烧 4. light v. 点燃 light the candle 点燃蜡烛 一. 自主探究，合作学习 1.He _the spoon_the bowl.他把汤匙放到了碗里面。 2.Lily _the bottle_water. Lily 把瓶子装满了水。 3.The room _ smoking. 屋子里充满了烟 。 4.Please put the jar _the candle.请把罐子放到蜡烛的 上面 。 5.My mother_her money to buy clothing yesterday. 我妈妈昨天买衣服花光(用光）了她身上所有的钱。 6.In our class,_ students are boys,_ students are girls. 在我们班，三分之二的学生是男生，三分之一的学生 是女生。 二. 小组合作操练，用上述新知识点造句，并在小组 内核对，交 流。 putin filled with is full of/is filled with over used up two-thirdsone-third 强化训练 单项选择 1.The bottle is only_full. A.half B.a half C. halfs D.halves 2.She _the chicken bones to make soup. A.Used for B. used to C.used up D.used with 3._of the students in our school_from countryside.(乡村 ） A.Four-fifths,comes B.Fourth-five,come C.Four-fifth,come D.Four-fifths,come 4._of water_. A. Three-fourths, are B.Three-four，is C.Three-quarters，is D. Three-fourth, is 4.The river is _here; we can walk across. A. deep B. fast C. shallow 5.Yellow is a _colour, but black is dark. A. orange B. light C. heavy A C D C C B summary The new words: match, light, burn, shallow, candleholder, oxygen, The phrases and expressions: use up, one-fifth, keep sb/sth doing, keep sth/sb +adj Stop doing/to do sth, put.in/over 分数的表达：分子基，分母序，分子大于 1，分母加 S sentences Fill the dish half full of water. As the candle burns, it uses up oxygen in the air. There is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar. How do “ keep the candle burning” Todays homework-its easy! With a group of classmates, practice the experiment. Do it again and again. As you do it, describe it in English. 用所给单词的正确形式填空： 1.You are very tired. Youd better stop _(have) a rest. 2. What do you use to make a candle _(burn)? 3. You should put the jar over the candle _(careful). 4. What _(observe) can you make? 5. Please cut the apple into _(half). 6. He _(light) a candle and the room was bright. 7. He kept the candle _(burn) for two hours. 8. Its time _(play) basketball. 9. Eating green food can help to keep you _ （health）. 10.Im sorry, I kept you_ (wait) for a long time. to have burn carefully observation(s) halves lighted/lit burning to play healthy waiting Look and Learn 1 .What are they ?They are_ They are used to _something. I will use them _a candle. I am _ the candle with the match. My father often uses matches _his smoke. 2.This afternoon well have a basketball_. matches light to light lighting to light match Look and Learn -Because burning needs _. when th