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(共24張PPT)
Unit 6 Get Close to Nature
Lesson 21 Snow Turns into Water
北京版 四年級(jí)上冊(cè)
Warm up
Look and guess
Who are they
They are Guoguo and Sara.
Where are they
They are on the way to school.
How is the weather
It is very cold.
How do you know it is very cold
They wear heavy coats, hats, scarves and gloves..
Read and answer
Guoguo feels very cold. How does Sara know
Sara sees Guoguo's red nose.
Read and answer
Where are they now
They are in the classroom.
What do you find on the window
Ice.
Read and answer
There is ice on the window. Why
It's warm in the room. When the water in the air meets the cold glass, it turns into ice.
Let's learn
Let's learn
Read and answer
What's the weather like now
It's snowing outside.
What do they want to do
Go out and have fun after class.
Let's learn
Where are they now
They are on the playground.
What happens to the snow
Snow turns into water.
Why
Because the sun has come out. It is warm.
Read and answer
Read and answer
cold
it is cold
water
the sun comes out.
[
Read and imitate
B
It is hot. Water turns into vapour （水蒸氣）.
Let's practice
B
A
It is cool. Vapour (水蒸氣） turns into rain.
Let's practice
B
A
C
It is cool. Rain turns into snow.
It is warm. Snow turns into water again.
Let's practice
Let's practice
Can you find some "water" in our life
When we have a fever, an _______ bag can help cool our body because it is very ________.
ice
cold
Let's practice
In summer, it is cool at night. So vapour (水蒸氣）turns into _________.
water
Let's practice
It is cold in the fridge.
_______ will turn into ______.
Water
ice
Let's practice
Can you think of something about "water" in our life
Water turns into _______ in winter.
ice
Let's practice
Can you think of something about "water" in our life
Ice turns into _______ in spring.
water
1. Recite the dialogue.
背誦對(duì)話。
2. Use the sentence pattern " It is ... ... turns into ..."
談?wù)勀銓?duì)水在不同溫度下的變化。
Homework

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