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四 教学重点、难点分析
教学重点：本课的重点为四会单词（match, light, burn, use up,)及用英语描述实验过程，通过听，读，反复呈现，实验操作来突出重点。
教学难点：Describe and explain the experiment in English.通过示范，实验操作来突破难点。
五 教学过程设计
步骤一：Class Opening.
1.Lead-in. Show the picture - the air pressure helps the cardboard hold the water in the jar and ask: What is happening? (The force of the air keeps the water in the jar.) Science is so interesting . Today we are going to look into science again and learn to do another experiment.
What experiment will we do? We’ll learn Lesson26: Keep the candle burning!
2.Learning aims. Show the learning goals and Let the students know what they will learn.
(1) New words: match, light, burn, shallow, candleholder, oxygen
(2) Phrases: use up, one-fifth
(3) Sentences:
① Fill the dish half full of water.
② As the candle burns, it uses up oxygen in the air.
③ There is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar.
(4) Describe and explain the experiment in English.
设计意图：用图片直接导入课题，形象直观，言简意赅。目标出示，让学生对本节课要学的内容整体感知并做到心中有数。
步骤二：New words.
1.Teach the new words（match , candleholder） with the real objects. Light the Lighter to teach “light”,and let the candle burn to teach “burn”...
2.Read and remember the new words.
3.Exercises:
(1) 英汉互译。
____________ 用光 ________________ one-fifth
____________ 一个装水的浅盘子 ________________ stop burning
(2) 用所给词的适当形式填空。
① Keep the candles _______(burn).
② Mother________(light) a candle and the room was bright.
③ Please cut the apple into_______(half).
④ Please pass me a box of________(match).
设计意图：用实物火柴，烛台教授match, candleholder，用动作点燃，蜡烛燃烧教授light, burn,并利用一个空火柴盒来教授use up 等能在学生头脑形成一个深刻的印象，并及时读，记忆，习题巩固。
步骤三：Learn the text and do the experiment.