Lesson 26 Keep the Candle Burning公开课教案（教学设计）

靖远县五合中学公开课教案

授课教师：姬俊梅

班级：九年级一班

授课时间：2018.11.9第二节

Lesson 26 Keep the Candle Burning 教学目标

1.记忆单词holder,shallow,lighter,match,examine,oxygen; 短语use up,be made up of。

2.掌握重点句型: ①When the candle stops burning, it has used up all the oxygen in the air. ②Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. ③How far does the water rise? ④Let the candle burn for two or three minutes.

3.激发学生兴趣,向他人介绍自己所做的有关燃烧的实验。

4.能够用英语描述和解释本课的实验。

教学内容：

1.学会并能正确使用单词及短语:holder,shallow,lighter,match,examine,oxygen,use up,be made up of。

2.能够运用下列句型:①When the candle stops burning, it has used up all the oxygen in the air.②Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.③How far does the water rise?④Let the candle burn for two or three minutes. 教学重难点：

1.

能够正确应用本课的重点词汇holder,shallow,lighter,match,examine,oxygen; 掌握短语use up,be made up of。

2.能够用英语准确地描述实验过程。

教学准备：

准备实验用的材料:一根蜡烛、一个烛台、一个大的玻璃罐、一个浅盘子和一些水、一个打火机。

教学过程：

Step1 Review Describe the experiment that we did yesterday. (通过对昨天实验的复述，回顾复习所学知识) Step2.Lead in

T:Hello,class.Today we’ll learn Lesson 26.Now please look at these things: a candle, a candle holder, a big glass jar, a shallow dish, some water and a lighter. Can you guess what we will do in this class?

Ss: Make an experiment.

T:Well done. This is an interesting class. We’ll make an experiment. Do you want to know what will happen? Now let’s begin our class.

[设计意图]

教师利用带来的教具,向学生们一一介绍，引起了学生对英语课学习的强烈的求知欲和好奇心，为本课的实验介绍奠定基础。

Step3.Presentation

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The teacher use material object to teach the new words . Ask students to try to read these words. The students follow the teacher three times. Then give the students five minutes to remember the words. Let students spell and read them one by one.

[设计意图]

教师以实物的形式呈现本课中出现的生词,领着学生们朗读并记忆,为下面的课文学习做好充分准备。

Step4. 1.Read the text aloud.

T:Boys and girls, it’s our reading time. Please read after the video and you should pay more attention to your pronunciation.

[设计意图]

让学生大声朗读课文,对课文的意思有个大致的了解,对于培养学生的正确发音以及培养学生的语感都有重要作用。

2.Careful reading.

Give the students several minutes to read the text by themselves.

Read the lesson and fill in the blanks.（let’s do it 1）

Let’s 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. 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.

【Keys】

match,Let,uses,burning,rises,one fifth

[设计意图]

学生再次阅读课文，对课文内容有更进一步的了解，提取文章的大意。

3.Read the text and find out main phrases and sentences.

Main phrases:

·use up

·be made up of

Main sentences:

·Science is so interesting!

·Fill the dish half full with water.

·Light the candle.

·Carefully put the jar over the candle until the top of the jar rests on the dish.

·The water inside the jar rises.

·Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.

[设计意图]

学生通过小组合作探究，找出文中的重点句子和短语，教师帮助学生讲解，为学生对文章的理解清除语言障碍。

StepⅣ.Project

1.Do the experiment in groups.

Read about the experiment in this lesson. With a group of classmates, practice the experiment. Do your experiment in front of the class. Don’t forget the following things:

·First, describe your experiment.

·Second, ask the class what they think will happen.

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·Third, do the experiment.

·Finally, ask the class if the result is what they expected.

2.Write an experiment report.

[设计意图]

小组合作做实验，一人做实验，一人写实验报告，其他成员用英语描述实验过程，锻炼学生的动手能力、写作能力以及口语表达能力。

StepⅤ.Practice（let’s do it 2）

Ⅰ.选词(组)填空

1.Don’t

(use up/push up)all of the ink. Leave some for me. 2.The medical team

(is made of/is made up of)five experienced doctors. 3.Please fill the hole

(with/in)sand and water. 4.They didn’t realize their mistake

(until/as)we told them. 5.My brother wasn’t

(strong enough/enough strong)to lift the box. [设计意图]

掌握本课的重点短语和句子之后做词汇练习,有效巩固本课所学知识点。

StepⅥ.Summary

In this class,we’ve learnt how to make an experiment and practice this experiment.

[设计意图]

给学生以总结,让学生明确这节课的学习内容。

StepⅦ.Homework

1.Finish off the exercises in the activity book.

2.Preview Lesson 27.

[设计意图]

让学生通过习题巩固本节知识点,并提前做好预习。

板书设计

Lesson 26 Keep the Candle Burning Main phrases: ·use up ·be made up of Key structures: ·When the candle stops burning, it has used up all the oxygen in the air. ·Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.

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教材解读☆

1.Science is so interesting!

◆so为副词,意为“这样,如此”,用于修饰形容词或副词的原级,表示程度。常见用法如下:

(1)“so+形容词+a/an+单数名词”相当于“such a/an+形容词+单数名词”。

(2)so后可接many, much, few和little来表示名词的数量。

(3)so…that…意为“如此……以至于……”,构成结果状语从句。

◆interesting为形容词,意为“有趣的”,表示事物本身含有令人感兴趣的因素,可作表语或定语,用于说明物。

【拓展】

interested也为形容词,意为“感兴趣的”,表示人对物的感受,在句中可作表语,常用于固定短语be/get interested in“对……感兴趣”。

2.Fill the dish half full with water.

half full with water为形容词短语,在句中作状语,表伴随状态。

3.Light the candle.

light为动词,意为“点燃”,可构成短语light up“点(烟),照亮”,宾语为代词时,应放在light与up之间。light的过去式和过去分词为lighted/lit, lighted/lit。

【拓展】

(1)light作名词时,意为“灯,光”。

(2)light作形容词时,意为“轻的,浅的”。

4.Carefully put the jar over the candle until the top of the jar rests on the dish.

carefully为副词,意为“细心地,认真地”,其形容词形式为careful,意为“小心的”。care可用作动词,意为“关心”,也可用作名词,意为“照顾”。

5.When the candle stops burning, it has used up all the oxygen in the air.

use up意为“用完,用光”,为“动词+副词”构成的短语。这类短语用名词作宾语时,名词可用在副词前,也可放在副词后;用代词作宾语时,代词则必须放在副词前,该短语相当于run out of…,可用于被动语态。

6.The water inside the jar rises.

rise为不及物动词,意为“升起,上升”,其过去式和过去分词分别为rose, risen。rise多用于表示日月星辰的升起、河水或物价上涨等方面。

7.Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.

◆one fifth意为“五分之一”,这是一个分数。分数的表达一般遵循以下规则:分子用基数词，分母用序数词；当分子大于一时，分母要用复数形式；并且其中的连词符号有时可以省略。

【注意】

分数后面跟of短语作主语时,谓语动词的单复数由of后面的名词的单复数决定。

◆be made up of意为“由……组成”,表示由多种成分、团体、成员或单位等组成,并强调整体的构成或组成。

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