课件49张PPT。 Keep the Candle Burning Lesson 26 Look into Science Unit 5课文呈现知识讲解…………Lesson 26 Keep? the Candle Burning词汇
听写课堂导入课文1结对活动课堂小结课后作业… 同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！Do you like doing science experiments?
Why or why not?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? 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!Science is so interesting!
I’m sure you’ll like this experiment!What do you need?
·a candle
·a candle holder
·a big glass jar
·a shallow dish
·some water
·a lighter or matches?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?10keep /ki?p/ v.保持 eg：You should keep the room clean.
你应该保持房间清洁。知识点1考向keep的用法： match/m?t?/ n.火柴，比赛 v.相称，相配 知识点2eg：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。 考向 match作名词时，为可数名词，复数为matches。
eg：Don’t strike matches if you smell gas.
如果你闻到煤气味，就不要划火柴。 half/hɑ?f/ adj.一半的 n.半； 一半 考向一知识点3eg：Given half a chance, he will succeed.
只须给他一点儿机会，他就会成功。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。 考向二典例 Half of the books ________ for students.
A．is B．are
C．am D．was【点拨】考查主谓一致。采用主谓一致法。句意为：一半
的书是给学生的。half of the books 意为：一半的书，所
以谓语动词用复数are。 Blight/la?t/ v. 点燃 知识点4eg：Will you light the fire for me，please?
请为我把火点燃，行吗？考向light的其他用法： until/?n't?l/ conj.直到……为止 知识点5eg：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。 考向二用于否定句中，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。考向一用于肯定句中，主句的谓语动词一般是延续性的。 典例I didn’t go to bed ________ my mother came back home last night. (青海)
A．since B．until C．when【点拨】句意：昨天晚上直到妈妈回家我才睡觉。表示“直到……才”，应使用not…until，故选B。 B as /?z/conj.当……时；随着 adv.如同
prep.作为； 如同考向一知识点6as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。 考向二辨析while，when与as： 典例 ________Betty came home yesterday evening,
the children were watching TV.
A．While B．As soon as
C．When D．Whenever【点拨】考查连词的用法。while“当……时，在……期
间”，引导时间状语从句，从句中的谓语动词必须是延
续性动词；when“当……的时候”，引导时间状语从
句，从句中的谓语动词既可用延续性动词，也可用非延
续性动词；as soon as“一……就”；whenever“无论何
时”。根据句意“当贝蒂昨天晚上回到家的时候，孩子
们正在看电视。”可知选C。 C stop/st?p/ v.停止 考向一【易错点】知识点7eg:They stop listening to music.他们停止听音乐。辨析stop doing sth.与stop to do sth. eg：Stop talking，please.请停止说话。
They stop to talk. 他们停下来说话。 考向二stop sb.(from) doing sth.阻止某人做某事。
eg：We stop the boys (from) climbing the tree.
我们阻止男孩们爬树。典例You look tired. You’d better ________ a good rest.
(山东烟台)
A．stop to have B．stop having
C．to stop to have D．to stop having【点拨】句意：你看起来很累。你最好停下来去好好休息
一下。had better后面用动词原形，意思是“最好……”。
stop to do sth.表示停下来去做另一件事，不定式表目的；
stop doing sth.表示停止正在做的事情。这里应该是指停下来去好好休息。故选A。 A use up 用完，用光 知识点8eg：He has used up all his money.
他已经用光了他所有的钱。考向与up有关的短语： 典例Clean Plate Campaign(光盘行动) calls on
Chinese people to ________ all the food each meal.
A．eat up B．use up
C．pick up D．cut up 【点拨】考查动词短语辨析。句意：光盘行动号召中国人
民每餐吃完所有的食物。eat up“吃完”符合句意。use
up“用完，用尽”；pick up“捡起”；cut up“切碎”均与句意不符。Ahow far 多远 考向一知识点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。 考向二【易混点】和how搭配的疑问短语还有： 典例—________is it from the village to your farm?
— About 10 minutes’ walk. (广东)
A．How often B．How soon
C．How long D．How far【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。 Done fifth 五分之一 考向【难点】知识点 分数的表达形式：分子用基数词表示，分母用序数词表示，当分子大于1时要把分母加s。注意：分数作主语时，谓语动词的单复数形式取决于其后的名词。10eg：There are two hundred teachers in our school and
three fourths of them are women teachers.
我们学校有200名教师，四分之三是女教师。
Two thirds of the students are boys in our class.
我们班三分之二的学生是男孩。
Two thirds of the area is under water.
三分之二的面积在水下。典例About ________ of the students like keeping diaries in English in our class.(贵州安顺)
A．two fifth B．two fifths
C．second five D．two five【点拨】句意：在我们班大约五分之二的学生喜欢用英语记日记。本题考查分数的表达方式。分数的表达形式是：分子用基数词，分母用序数词。当分子大于1的时候，分母要加s。“五分之二”应该是 two fifths，故选B。B1.Read the lesson and fill in the blanks.
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. match Let uses Let's Do It !
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. burning rises one fifth
2.Circle the correct words to complete the sentences.
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.Let's Do It !
PROJECT
SCIENCE？THAT’S INTERESTING! 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：
11 ·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. Let's Do It !in front of 在……的前面 知识点eg：There is a big tree in front of the
classroom.
在教室的前面有一棵大树。11考向辨析 in front of与in the front of用图片表示为： 本节课主要学习了以下重点内容:
（1）重点单词：keep，match，half，light，
until，as, stop等。
（2）重点短语：use up, how far, one fifth等。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 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．failingBB8．—Dad，why should I stop __________ computer games?
—For your health, my boy.
A．to play B．playing
C．Play D．played
9．(中考·安徽) Mrs. King put a coat ________ the
sleeping girl to keep her warm.
A．over B．with
C．behind D．beside
10．(中考·安顺)About ________of the students like
keeping diaries in English in our class.
A．two fifth B．two fifths
C．second five D．two fiveBBA三、连词成句
11．should，the，keep，clean，bedroom，we(.)
_______________________________________________
12．nations, up, our, made, country, is, of, 56(.)
_______________________________________________
13．far，water，rise，how，does，the(？)
_______________________________________________
14．sure，will，the，pass，exam，you，I’m(.)
_______________________________________________
15. is, beautiful, lighter, your, expensive, and, how(！)
______________________________________________
How beautiful and expensive your lighter is!Our country is made up of 56 nations. We should keep the bedroom clean. How far does the water rise? I’m sure you will pass the exam. 1.熟记本课时的词汇
2.完成本课时的课后作业
