Unit3 Care for the earth 课件(共20张PPT)

(共20张PPT)
Review
Make the air dirty
What is bad for the earth
Pick up flowers
Cut down trees
Drive a car
Waste water
Lead-in
Do you like our mother earth Why
Read and think
Bird ：Help！Help！
Colin : What’s the matter , little bird
Bird : I can’t find my home.
What should I do
Colin : Oh, poor little bird!
Fish : Help! Help!
Wu Chen: What’s the matter, little fish
Fish : The water is too dirty. I can’t live here.
Wu Chen: Oh, poor little fish!
Little bird: Because the trees are cut down(被砍伐)，
the little bird loses its home——forest. So it calls for help.
Little fish: Because the water is polluted(被污染), the river becomes dirty. So the fish has no place to live.
Why does the little bird and little fish say help
Today we are going to learn how to care for
our green earth.
Let’s talk
Mom : Some more soup , dear
Su Nan : Thanks , Mom. But I have no time. I have to
clean my bike.
Mom : Are you going to school by bike Why not go
in your dad’s car
Su Nan : We shouldn’t drive the car today.
Mom : Why
Su Nan : Because today is World Car Free Day . It’s
time do something for our earth.
Mom : I see. I think I should go to work on foot today.
Su Nan : Great, Mom ! Thank you.
Mom : Some more soup , dear
Su Nan : Thanks , Mom. But I have no time. I have
to _______________.
Mom : Are you going to school by bike Why
、
not go in your dad’s car
Su Nan : We shouldn’t ____________ today .
Mom : Why
Su Nan : Because today is___________________. It’s
______do something for our earth .
Mom : I see . I think I should go to work _______today.
Su Nan : Great, Mom ! Thank you.
Fill the blanks.
clean my bike
drive the car
World Car Free Day
time
on foot
Read and answer.
1. When is World Car Free Day
2. Why does Su Nan stop eating
3. Does Su Nan will go to school in his father’s car
why
4. How will mother go to work
September 22.
Because he has to clean his bike.
No, he doesn’t. Because it’s World Car Free Day.
On foot.
I have to clean my bike.
我必须去清洁我的自行车。
【句型剖析】
本句中have to是情态动词，意为“必须；不得不”。其后要接动词原形，有人称、数和时态的变化。
【例句】I have to go to school on Monday.
我星期一不得不去上学。
She has to go now. 她现在不得不走了。
Language points
have to 不得不;必须 强调客观的需要，有人称、数和时态的变化。
must 必须 强调说话人主观上的看法。没有人称、数和
时态的变化。
have to与must
2.Are you going to school by bike？
你打算骑自行车去学校吗？
【句型剖析】
本句是一般将来时态的一般疑问句。它的陈述句为：I am going to school by bike.我打算骑自行车去学校。主语+be going to+动词原形，表示“某人打算或将要做某事”，是一般将来时态的一种形式。一般将来时态还有另一种形式：主语+will+动词原形，表示“某人将要做某事”。
【例句】I am going to play the violin.
我打算拉小提琴。
I will go to Beijing this summer holiday.
这个暑假，我将要去北京。
【练一练】
I am going to learn English.(将句子变为一般疑问句)
____________________________________
Are you going to learn English
4.I think I should go to work on foot today.
我想我今天应该步行上班。
【句型剖析】
should是情态动词，意为“应该”，后面接动词原形，它的否定形式是shouldn’t，意为“不应该”。
【例句】We should be nice to others.
我们应该对其他人友好。
We shouldn’t go to school late.
我们不应该上学迟到。
Exercise
单项选择。
1.I ______clean my bike.
A.do B. have C. have to
2.What’s the matter _____ you
A. for B. with C. to
3.Are you going to school _____bike
A. by B.to C. take
4.Why not______ in your dad’s car
A. going B. go C. goes
5.We shouldn’t _______a car today.
A. drives B.to drive C. drive
C
B
A
B
C