Unit 5 Lesson 26 Keep the Candle Burning教学设计

L26 Keep the Candle Burning
教学设计
教学目标：
知识与技能目标：能熟练记忆、使用match（matches）,holder, shallow, lighter; oxygen; use up等单词和短语。
过程与方法目标：让学生知道能够用英语正确地描述和解释本课的实验，训练学生听，读，说，练等技能。
情感态度与价值观：培养学生集中注意力的学习态度，并积极思考，培养学生热爱科学的精神。
教学重难点:
重点：掌握本课单词和短语，用英语准确地描述实验过程，通过听、读，反复呈现，实验操作突破重点。
难点：通过示范，实验操作来突破难点。
教学思路:
本课以“让蜡烛持续燃烧”为题，以一个有趣的实验为主线，既渗透了有趣的科学知识，又练习了用英语表达次序。从实验的材料，到实验步骤，再到实验结论，环环相扣，层次分明。课堂设计做实验，激发和培养学生的学习兴趣，鼓励学生大胆实验，勇于探索，热爱科学。
教学准备：
A candle, a candle holder, a big glass jar, a shallow dish, some water, a lighter, a surprise box, PPT
教学过程：
Step1 Warming up (5 mins)
1. Greeting each other
2. Free talk (A student does an experiment in lesson 25 ,and describe it in English.)
3. Lead the new lesson
Today we will learn to do another experiment :keep the candle burning!
Step 2 Presentation (5mins)
What do we need Watch and learn some new words. (图片展示,形象生动)
Find a student to introduce the materials in front of the class.
We need a candle ,a candle holder, a big glass jar ,a shallow dish ,some water , matches or a lighter .(besides oxygen, examine.)
Practice the new words.(加深对于生词的记忆，为了更好的描述实验。)
Use the new words to fill in the blanks.
Put the candle in the c__________.
Please light the candle with a m______.
Plates are ________ （浅的）than bowls.
We need o______to live .
To make the candle b_____for two or three minutes,you light it.
3. Listen and fill in the blanks.（听力听两次，训练孩子听力的同时熟悉实验步骤）(4mins)
4 .Do the experiment(由学生用英语根据课件显示陈述实验步骤，老师进行实验演示，并引导学生注意观察实验结果并得出结论)(10mins)
What can we see ① The candle stops burning.② The water in the jar rises .
5 .Find two students to do the experiment again.(找两组学生；一位学生陈述实验步骤，另一位学生根据实验步骤操作试验，让学生自己动手，并观察调动了学生学习的积极性。)
Step4 Read the passage aloud and think(5mins)
1. why does the candle stop burning
Because it has used up the oxygen in the air.
2. Why does the water rise
Because the force outside the jar is stronger than the force inside the jar.
3. How far does the water rise
The water rises and fills about one fifth of the jar. Because about one fifth of the air is made up of oxygen ,
Step5 play a game --lucky box(根据课程内容采用抽取任务并给与小奖品的形式与学生进行互动，既调动学生参与课堂的积极性，让学生主动学习；又再一次熟悉了实验的步骤，加深了学生对文章的理解。)(7mins)
eg.Task A: spell “oxygen”
Task B:translate step 6 into Chinese.
Task C; state the steps of the experiment.
Task D； Lucky boy
:
:
Step6 Explain the language notes.分数表达法（复习基数词和序数词）
Be made up of use up(8mins)
Step 7 Summary（2mins）
Step 8 Science saying（拓展学生知识，增强学生学习英语的兴趣。）
Step 9 Homework .
板 书 设 计
Keep the candle burning
New words New phrases 分数表达法：分子基，分母序，
分子>1, 分母+s
keep…burning
use up
one-fifth
be made up of
What do we do ？
First, _____the candle __the candle holder.
Second, _____the candle holder ___the dish .
Third, ____the dish ___________ water.
Fourth,_____the candle.
Fifth, ______the candle ______for two or three minutes.
Then, carefully ___the jar ____the candle until the top of jar rests on the dish .
Last,___ the water in the jar,