初中英语冀教版九年级上册Lesson 25 Let’s Do an Experiment!精品学案设计

Lesson 25 Let’s Do an Experiment!   导学案

【学习目标】

1.重点单词:

experiment,jar,upside,pour,correct,scientific,method,raincoat,force,pressure,conclude

2.重点词组: turn…upside down,pour out,scientific method,take…off

3.重点句式:

(1) Then I turn the jar upside down and take my hand off the cardboard.

(2) It is strong enough to hold the water.

【重点难点】

1. 重点：掌握重点短语和句型

2. 难点：sb.+besure+that 从句“某人认为……一定……”。

          enough 用法。

【导学过程】

一、课前预习

核心单词

1. ________adj. 正确的；恰当的 2. ________n. 方法

3. ________n. 力量 v. 迫使；强迫 4. experiment n. ________

5. jar n. ________ 6. upside n. ________

7. pour v. ________ 8. scientific adj. ________

9. raincoat n. ________ 10. pressure n. ________

11. conclude v. ________

单词变形

1. scientific→________(n. 科学家) 2. conclude→________(n. )

二、课堂学习

Step 1. 自主探究，合作交流

根据课文内容回答问题

1. Where does Danny think they should do the experiment? 

2. What keeps the water in the jar?

3. Is Jenny sure of her theory? How do you know?

4. Why does Danny put on his raincoat?

5. What does Danny conclude?

Step 2. 交流展示

1. What kinds of experiments have you done in science class?

在科学课上你做过那些种类的实验。

 experiment  n．实验；试验；“做实验”可用do/make/carry out an experiment表达。

experiment v．做试验，进行实验，常和介词_____________连用。

1) 许多人不赞成在动物身上做实验。

   Many people are against____________________  on animals. 

2) 他正在青蛙身上做试验。

   He is experimenting__________  frogs.

2. I cover the top with a piece of cardboard and hold it there.

我用纸板把上面盖住然后托住它。

_______________________句式意为“用……覆盖……”，

类似句式___________________表示“被……覆盖”，这是一个系表结构。

1) 我妈妈用布把桌子盖住了。

My mother__________________  the table cloth.

2) 床上盖满了纸。

The bed___________________ paper.

3. force n．&v．意为“力量 迫使；强迫”，force作动词时，常用的句式为：force sb.to do sth.＝__________________________________意为“强迫某人做某事”。

They forced him to leave his country. (改为同义句）

They forced him _______ _______ his country.

三、知识点拨：

1.fill...with...用……装满……

He has filled his case with many books.

cover...with...用……盖住……

I cover the top with a piece of cardboard.

2.upside down向下翻转过来

You hold the book upside down.你把书拿倒了。

right side up正面朝上

3.be sure表示肯定,有把握;而be not sure 表示不确定。

be sure/be not sure后可接句子,还可接代词、名词、动名词或不定式。

常见用法:be sure of sth., be sure of (doing) sth., be sure to do sth., be sure that...

4.take...off...意为“把……从……拿开”。

Please take your hand off the food.

take off摘掉,脱掉;起飞

When will the plane take off?

5.enough 的用法

enough 与修饰词的排列顺序:

(1)作形容词时,置于名词前后均可;

(2)作副词时,置于所修饰的形容词、副词之后。

enough to do sth.常与too...to或so...that进行句型转换。

Tom isn’t old enough to go to school.

→Tom is too young to go to school.

→Tom is so young that he can’t go to school.

四、【知识巩固】

Ⅰ.用括号内所给单词的适当形式填空

1.He locked the door 　　　(careful) before he left. 

2.Let’s 　　　(finish) the work together now. 

3.Can you guess what 　　　(happen) in 100 years? 

4.What’s another way of 　　　(say)“autumn”? 

Ⅱ.根据汉语意思完成句子

1.我确信你是一个诚实的人。

I 　　　 　　　 that you are an honest man. 

2.请用一块玻璃盖上那个杯子。

Please 　　　 the cup 　　　 a piece of glass. 

3.小心,否则你会弄湿的。

Be careful,or you’ll 　　　 　　　. 

4.把箱子倒过来,你会找到标签的。

　　　 the box 　　　 　　　,then you’ll find the label. 

答案：

一、课前预习

核心单词　1.correct　2.method　3.force　4.实验；试验

5．广口瓶；罐子　6.上部；上边　7.倒出；倾倒　8.科学的

9．雨衣　10. 压力，压强；挤压　11.得出结论；断定；推断出

单词变形　1.scientist　2.conclusion

二、Step 1.自主探究，合作交流：

1. Outside.

2. The force of the air.

3.  Yes, she is. She asks Brian to do the experiment over Danny’s head and she knows he won’t get wet.

4. He is afraid to get wet.

5. The air is stronger than he thought.

Step 2. 交流展示

1. on，with  1) doing experiments    2) on

2. cover...over;  be covered with; 1) covers, with   2) is covered with

3. force sb.into doing sth.         

into leaving his country

四、【知识巩固】

Ⅰ.1.carefully　2.finish　3.will happen　4.saying

Ⅱ.1.am sure　2.cover;with　3.get wet　4.Turn;upside down