Unit 5 Look into Science Lesson 25 Let’s Do an Experiment! 课件21张

(共30张PPT)
Look into Science
冀教版　九年级
Let’s Do an Experiment!
Objectives
Master the new words and expressions: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude, fill…with, cover…with, turn…upside down, pour out
2. To understand the theory of the experiment.
3. To do the experiment and get the
scientific conclusion.
Think about it!
1. What kinds of experiments have you done in science class?
2. If you hold a jar that is filled with water upside down, what will happen?
* Where does Danny think they should do the experiment.
* What keeps the water in the jar?
* Is Jenny sure of her theory? How do you know?
* Why does Danny put on his raincoat?
* What does Danny conclude?
Read the dialogue with the following
questions.
Work in groups and think of this experiment.
Discuss it and write down how we do it.
Step 1 Preparation:
Make a list of the materials and tools that we will use in the experiment.
Water, a jar, a piece of cardboard.
Step 2 Theories:?
Write down two different theories.
1. The floor will get wet.
2.?The floor won’t get wet.
Step 3 Main steps:
1. Fill a jar with water.
2. Cover the top with a piece of cardboard.
3. Turn the jar upside down.
4. Take off the hand.
Step 4 Result:?
The force of air will keep the water in
the jar.
How do we do the experiment?
Let’s do an interesting experiment. First,
I ___ a jar ___ a desk, ___ it ____ water, then _____the top ____ a piece of cardboard. When I ____the jar ______ _____, can you guess what will happen?
put
on
fill
with
cover
with
turn
upside
down
1. I fill a jar with water.
我用水把瓶子装满。
fill …with… 用……装满……
He has filled his case with many books.
他已经把书装满了箱子。
cover…with… 用……盖住……
I cover the top with a piece of
cardboard.
fill …with… 用……装满…… (主语是人)
be full of … / be filled with… (主语是物或容器)
同义句转换。
1.The rooms are full of the students now.
The rooms _____ _____ _____ the students now.
2.My pocket is filled with the money.
My pocket _____ _____ _____ the money.
选择。
5. Can you ______ the box _______ books? ( )
A fill ,with B full ,with C filled ,with D full , in
6.The child _____ all the bowls ______ water.( )
A fill,with B fills, with C is full ,with D is filled ,with
are filled with
is full of
A
B
学以致用
2. I turn the jar upside down.
我把广口瓶倒置。
upside down 的意思是“向下翻转过来”。
You hold the book upside down.
你把书拿倒了。
right side up 是“正面朝上”的意思。
3. I’m sure the floor won’t get wet.
我确信地板不会湿。
be sure +that 从句表示“认为……一定……”。
而be not sure表示不确定。 eg.
I’m sure she will come here.
我确信她会来。
I’m not sure when he’ll come here.
我不能肯定他什么时候来这儿。
三、 I’m sure the floor won’t get wet. 我确信地板不会湿。
b e 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 sb / doing sth , be sure to do sth
完成下列各题。
1.我确信她会来。_________that she will come here.
2.他没有把握通过考试_____________to past the exam.
3.I’m sure _________ Jim plays basketball well .（ ）
A of B to C that D with
I’m sure
He’s not sure
C
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 will ____ ____.
4. 把箱子倒过来，你会找到标签的。
___ the box _____ _____, then you’ll find the label.

sure
with
get
am
cover
wet
Turn
upside
down
1.用……把……装满 ______________
2.用……把……盖住 ______________
3.我(不)确信…… _________________
4.正面朝上 ______________
5.把……翻转_______________________________
6.get wet __________ 7.do an experiment __________
8.a piece of cardboard ______________
9.inside（反义词） ________ 10.theory（复数） _____ 11.careful (副词）_______ 11.science(形容词）______
fill…with…
cover …with…
I am (not) sure…
right side up
turn …upside down / turn …over
变湿
做一个实验
一块硬纸板
outside
theories
carefully
scientific
请根据课文内容, 以 “An Interesting
Experiment”为题写一篇小作文。