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(共32张PPT)
Unit 4 Natural disasters
Period 3 Grammar
（沪教牛津版）九年级
下
Learning objectives
1
3
Presentation
Have a go
5
Group work
Summary
7
Homework
2
4
6
8
Assessment
Lead in
By the end of the lesson, I will be able to ...
1
2
3
Learn and understand the three uses of it as an empty subject;
Be aware of the use of it as an empty subject in different contexts and use it correctly;
Write your own story using it as an empty subject.
Learning objectives
01
Mike’s story
Lead-in
02
Lead-in
02
Lead-in
02
Lead-in
02
Lead-in
02
Do you know what it refers to
Lead-in
02
it 代指具体事物， 可以用来代替一个名词,一个代词或一个句子，在句中作主语。
it做主语，代指new job
Presentation
03
1. It started to worry me.
2. Water was everywhere. It covered roads, parks and small houses.
3. Very soon, the water came into people’s room. It poured onto their desks and covered their computers
Underline the sentences in the Great Flood and find out what it refers to.
Presentation
03
Presentation
03
it 做主语 代指具体事物
it 做形式主语 ，没有具体意义
Presentation
03
We can use it as the empty subject like this:
It is one o’clock.
It is summer now.
It rained all day.
It is only a five-minute walk from my home to the school.
It is hot in this room.
时间
季节
天气
距离
温度
Using it as the empty subject
Presentation
03
It’s nine o’clock in the morning. My bedroom floor is a pool of water.
Work out the rule
We often use it to refer to the ________, ________, ________, distance and temperature.
time
season
weather
Presentation
03
We can use it as the empty subject like this:
it 做形式主语，代替动词不定式
To wake up early is difficult for Mike.
Using it as the empty subject
Presentation
03
it 做形式主语，常见句型：
1. It is adj for/of sb to do sth
It is interesting for us to play badminton.
It is kind of you to help me.
2. It takes sb 多长时间 to do sth
It takes him an hour to do his homework every day.
3. It is+n. to do sth
It was a great pleasure to work with you.
Presentation
03
It took a long time to build the house.
It is wrong to pay no attention to Kevin.
It is not a good idea to sit around and worry about the flood.
To build the house took a long time.
To pay no attention to Kevin is wrong.
To sit around and worry about the flood is not a good idea.
Presentation
03
We can also use it as the empty subject in the following sentence pattern:
It seems/appears that …
Use it as the empty subject of a sentence to replace a sentence.
Using it as the empty subject
A Answer the questions using it as the subject.
1 What is the weather like today
2 What is the time now
3 What is the date today
4 What is the season now
5 How far is your home from school
It is sunny.
It is five o’clock.
It is 27 June.
It is summer.
It is three kilometres.
Have a go
04
Have a go
04
Using it as the empty subject
B Put the words in the correct order to make meaningful sentences.
1 now/for supper/it/time/is
2 autumn/in Australia/now/it/is
3 about five kilometres/it/is/to the park
4 windy/was/it/yesterday
It is time for supper now.
It is autumn in Australia now.
It is about five kilometres to the park.
It was windy yesterday.
Have a go
04
C Write a sentence using it and a to-infinitive under each picture below.
It is important to stay calm when there is a fire.
It is dangerous to start a fire in the forest.
It is a good idea to take an umbrella.
It is nice to have a picnic in the park.
Have a go
04
Have a go
04
D Put the words in brackets in the correct order to complete the conversations.
It seems that a typhoon is coming.
It appears that the flight has been cancelled.
It seems that something bad has happened to her.
Thinking
04
What does it refers to
Group work
05
1. Use “it” to make up your own story.
2. Share your story in group and tell us what it refers to.
Summary
06
The grammar we have learned
1. I dropped my watch and it broke.
it用于上文提到的情况
2. Is it a boy or a girl
it 指性别不明的婴儿或用于确认某人的身份
3. It’s too late to go there now.
It rained all day yesterday.
it 用于指时间、距离、价值、天气等自然现象
4. I find it difficult to do the job well.
it用作形式宾语
Summary
06
Extension
1. To have a good knowledge of history is very helpful for all of us.
2. To learn a foreign language is very useful for a scientist.
3. To finish this work in three hours is necessary.
It is very helpful for all of us to have a good knowledge of history.
It is very useful for a scientist to learn a foreign language.
It is necessary to finish this work in three hours.
用it作形式主语改写句子。
Assessment
07
Self-assessment
How well do you know about this lesson Tick (√)the boxes.
I can understand the three uses of it as an empty subject. 口 口 口
I can use of it as an empty subject in different contexts. 口 口 口
I can write your own story using it as an empty subject. 口 口 口
Homework
08
拓展：完善自己的小故事。
基础：整理本堂课语法知识的思维导图。
提升：完成本单元语法小卷。
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