Unit 5 Lesson 26 Keep the Candle Burning 课件 (共25张PPT)2024-2025学年英语冀教版九年级全一册

(共25张PPT)
Unit 5
Look into Science
Lesson 26
Curriculum words：holder, shallow, lighter, match, examine, oxygen
Useful expressions： Let the candle burn for two or three minutes. When the candle stops burning, it has used up all the oxygen in the air.
Functions：Master the new words： holder, shallow, lighter, match, examine, oxygen
Grammar：as的用法
Sentences： Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. How far does it rise
学习目标
Do you like doing science experiments Why or why not
Lead in
THINK ABOUT IT
Do you like doing science experiments Why or why not
What will happen if you put a jar upside down over a burning candle
新课讲授
Text presentation
What do you need
·a candle
·a candle holder
·a big glass jar
·a shallow dish
·some water
·a lighter or matches
Science is so interesting! I'm sure you'll like this experiment!
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!
What do you do
1．Put the candle in the candle holder.
2．Put the candle holder on the dish.
3．Fill the dish half full with water.
4．Light the candle.
5．Let the candle burn for two or three minutes.
6．Carefully put the jar over the candle until the top of the jar rests on the dish.
7．Examine the water in the jar. What can you see
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
Read the lesson and fill in the blanks.
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.
match
Let 's Do It !
Let
uses
burning
rises
one fifth
Circle the correct words to complete the sentences.
2
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.
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.
· Third，do the experiment.
· Finally，ask the class if the result is what they expected.
REPORT ON AN ACCIDENT
keep 的用法
Point 1
Language points
keep＋宾语＋形容词，意为“使……保持某种状态”。 You can't sneeze and keep your eyes open at the same time.
你不能在打喷嚏的同时让你的眼睛睁着。
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！
match /m t / n.火柴，比赛 v.相称，相配
Point 2
eg：We need to light a match.
我们需要点一根火柴。
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的比赛。
The picture matches the story.
这幅图和故事相配。
half /hɑ f/ adj.一半的 n.半； 一半
Point 3
half 意为“一半的”，作形容词。
half an/a ＋名词，意为“半个…… ”。
eg：half an hour 半个小时
half a day 半天
half an apple 半个苹果
Given half a chance, he will succeed.
只须给他一点儿机会，他就会成功。
half of…意为“一半的……”，后接名词时，一般要在名词前加the、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of后的名词保持一致。即：若of后的名词是复数则谓语动词用复数形式；若of后的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。
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。
Don't forget to turn off the lights when you leave.当你离开的时候不要忘了关灯。
adj. 意为“浅色的，轻的”。 Rose likes the light green skirt.
罗丝喜欢那条浅绿色的短裙。
light 的用法
Point 4
light /la t/ v. 点燃
eg：Will you light the fire for me，please 请为我把火点燃，行吗？
until/ n't l/ conj. 直到……为止
Point 5
eg：I'm 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。
用于肯定句中，主句的谓语动词一般是延续性的。
用于否定句中，主句的谓语动词一般是非延续性的。
eg：I didn't begin the work until he came back.
直到他回来我才开始这项工作。
as conj.当……时；随着 adv.如同prep.作为； 如同
Point 6
as可作连词，意为“随着，当……时”。
eg：As time went by, the environment got worse and worse.
随着时间的推移，环境变得越来越糟了。
辨析 while，when 与 as
Point 7
while 表示“在……的时候，在……期间”。它强调主句的动作与从句的动作同时发生或主句的动作发生在从句动作进行的过程中。while从句中的谓语动词必须是延续性动词。
when 表示“当……的时候”。从句中的谓语动词既可用延续性动词，又可用非延续性动词，这些动词既可以表示动作，又可以表示状态。也就是既可以指较短的时间(即某一具体时间)，也可以指一段时间。主句和从句的动作可以同时发生，也可以先后发生。
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的动作同时发生，不是一前一后。因此，还可意为“一边……一边……”。
辨析 stop doing sth. 与 stop to do sth.
Point 8
stop doing sth. 停止正在做的事，doing sth.作宾语。
stop to do sth. 停下(正在做的事)去做另一件事，
to do sth.作目的状语。
how far 多远
Point 9
用于询问两地间的距离，答语也要用表示距离的句子。
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分钟的路程。
how much 询问价格以及不可数名词的数量。 How much is the meat？肉多少钱？
How much water do you want？
你想要多少水？
how many 询问可数名词的数量。 How many stamps have you collected？
你已经收集多少张邮票了？
how old 询问年龄。 —How old is your sister？
你妹妹多大了？
—She is seventeen. 她十七了。
典 例
—________is it from the village to your farm
— About 10 minutes' walk.
A．How often 　　　　 B．How soon
C．How long D．How far
D
【点拨】考查疑问短语的辨析。采用逻辑推理法。how often 多久一次；how soon 多久以后；how long 多长；how far 多远，对距离提问。由句意“从村庄到你的农场有多远？”“大约步行10分钟的路程。”可知选D。
一、根据汉语提示完成句子
1．Please pass me a ________ (浅的) dish.
2．I need some ________ (火柴) to light the candles.
3．There is one fifth ________ (氧气) in the air.
4．After finishing all your work，you should ________ (检查) it carefully.
5．We have __________ (用完) our salt.
shallow
matches
oxygen
当堂检测
examine　
used up
二、单项选择
6．Jim ________all his money to buy the computer.
A．fixed up B．used up C．ate up D．Got
7．— Have you finished the work
— Not yet，but no matter how hard it is， we'll keep________ until we finish it.
A．failed B．trying C．tried D．failing
B
B
课堂总结
Structure
Let the candle burn for two or three minutes. When the candle stops burning, it has used up all the oxygen in the air.
Key Words
holder, shallow, lighter, match, examine, oxygen
Key sentences
Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. How far does it rise
Expressions
As the candle burns，it uses the oxygen in the air.