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(共20张PPT)
How do things change
Period 1
Things in different states
A. Look at the picture.
What is the weather like
What can you see in the picture
Ask and answer.
B. Watch the video.
What things change
Why do they change
Watch and answer.
C. Think and discuss.
Can water change What does it change into
Water can change into ...
Water can change into snow, ice or steam.
What else can change
Many things can change.
We can ...
blow up the balloon
melt the butter
use fruit to make juice
Think and answer.
How can water change
Think and discuss.
What are they How can they change
water
snow
ice
steam
How can water change
Share and say.
Water comes in different states.
It can change.
It can change into steam when we boil the water.
It can change into ice when it’s very cold.
Put the ice into hot water. It’s water again.
A. Listen. Then point and say.
Listen and answer.
What are these pictures about
Water in different states
liquid
solid
gas
Listen and follow.
Water is a liquid.
We drink water every day.
Ice is a solid.
It’s cold and hard.
—Can you hold gas
—No, I can’t.
Ask and answer.
What can you see
Is it a liquid, a solid or a gas
sugar
salt
cream
Things in different states
Look and say.
Ice cream is a ... (solid/liquid/gas)
On a hot day, ice cream can ...
melt
Listen and follow.
Put some sugar in the milk.
It tastes sweet.
Add some salt to the soup.
There’s some cream.
Ice cream melts quickly on a hot day.
B. Choose and say.
Look and match.
spring
solid
liquid
gas
Three states
d
b, e
a, c
Look and say.
… is a ...
(gas/liquid/solid)
C. Read the causes and write the effects.
Read and answer.
Lu Hang is cold. His mother heats some
water and makes him some lemon tea.
Lu Hang drinks the tea and feels warm.
Why does Lu Hang’s mother make lemon tea
Cause
Effect
Lu Hang is cold. His mother heats some
water and makes him some lemon tea.
Lu Hang drinks the tea and feels warm.
In the afternoon, Lu Hang is hungry.
His mother heats water in a pot, and
puts in some chicken and carrots. Lu
Hang eats the soup and feels good again!
Read and underline.
What happens when Lu Hang drinks the tea
What happens when he eats the soup？
C. Read the causes and write the effects.
Cause
Effect
A cause is why something happens.
The effect is what happens after the cause.

He feels warm.
He feels good again!
Cause
Effect
Lu Hang drinks the tea.
He feels warm.
Lu Hang eats the soup.
He feels good again!
Look and read.
Think and discuss.
How do things change
Water can change into ice, snow or steam.
Put the sugar into the milk. It tastes sweet.
…
Ice cream melts quickly on a hot day.
1. 朗读Unit 7 P62的内容。
2. 说一说物体的不同形态。
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