Module 2 Environmental problems Unit 4 Natural disasters Grammar-课件(共28张PPT)

(共28张PPT)
Module 2
Unit 4
Environmental problems
Natural disasters
To learn to use it as the empty subject
Objective
Using it as the empty subject (I)
It’s nine o’clock in the morning. My bedroom floor is a pool of water.
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.
It’s ___________ in the morning. My bedroom floor is a pool of water.
___ is one o’clock.
It is ________now.
It ______ all day.
___ is only ________________ from my home to the school.
___ is ___ in this room.
nine o’clock
It
summer
rained
a five-minute walk
It hot
It
go
Ready
翻译下列句子。
现在十二点十分。
距离海滩两英里远。
今天早晨下雨了。
现在天气相当暖和。
It’s ten past twelve.
It’s two miles to the beach.
It was raining this morning.
It’s quite warm at the moment.
Observe these sentences and think about what it refer to.
the time
the season
the weather
the distance
the temperature
weather
time
season
代词it可用作主语，表示时间、季节、天气、温度或距离等。如：
It is half past twelve.
It is spring.
It is fine today.
It is twenty-five degrees centigrade.
It is two kilometres to the post office.
it 的用法 I
Answer the questions using it as the subject. (P 55)
A
It is sunny.
It is five o’clock.
It is 27 June.
It is summer.
It is three kilometres.
Put the words in the correct order to make meaningful sentences. (P 56)
B
It is time for supper now.
It is autumn in Australia now.
It is about five kilometres to the park.
It was windy yesterday.
Using it as the empty subject (II)
My boss has given me some work. It’s important to stick with it.
2. It took a long time to build the house.
3. It is wrong to pay no attention to Kevin.
4. It is not a good idea to sit around and worry about the flood.
5. It seemed that nowhere was too far for Zheng He to visit.
6. It seems/appears that nobody is paying any attention to the flood.
My boss has given me some work. ____ important __________ it.
__ took a long time _______ the house.
3. ___ is wrong _____ no attention to Kevin.
4. ___ is not a good idea ___________ and ____________ the flood.
5. It _______ that nowhere was too far for Zheng He to visit.
6. ___________________ nobody is paying any attention to the flood.
It’s
to stick with
It
to build
It
to pay
It
to sit around
worry about
seemed
It seems/appears that
go
Ready
Everyone knows that ____ is dangerous to play with fire, but ____ is difficult is to prevent children from playing with fire.
A. it, it B. what, what
C. it, what D. what, it
Observe these sentences and think about what it refers to.
形式主语
真正的主语
当句子的主语是动词不定式短语时，一般用代词it 作形式主语放在句首，而将真正的主语动词不定式短语放在句末。如：
It is pleasant to sit in the Sun.
It was a pleasure to sit in the Sun.
it 的用法 II
注意：
“It + is + 形容词 + for + 宾语 + to do sth.” 句型通常与表示可能性、必要性、重要性、紧迫性、频繁程度以及价值判断等的形容词连用。如：
It is impossible for me to finish the writing in half an hour.
It is strange for her to be late for school.
Rewrite the sentences below using it as the empty subject.
Practise
1.To learn English well is not easy for him.
2.To study two languages is very hard.
3.To find out the truth is important.
It is not easy for him to learn English well.
It is very hard to study two languages.
It is important to find out the truth.
Write a sentence using it and a to-infinitive under each picture below. (P 57)
C
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.
it 作为形式主语还常见于It seems / appears that… 的句型中。如：
It seems/appears that his mother knows the truth.
具有最高“信息价值”的较长、较复杂的结构通常位于句末，因此，我们常使用带 “形式主语it”的结构，而将充当主语的从句或动词不定式移到句末。
Put the words in brackets in the correct order to complete the conversations. (P 57)
D
It seems that a typhoon is coming.
It appears that the flight has been cancelled.
It seems that something bad has happened to her.
早上九点钟。
2. 坚持做完工作很重要。
3. 他们似乎并不想离开。
1. It was nine o’clock in the morning.
2. It’s important to stick with it.
汉译英。
3. It seemed that they did not want to leave.
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.
I. 用it作形式主语改写句子。
现在十点半了。
好像他又犯了同样的错误。
在那个城市夏天炎热冬天寒冷。
很容易理解他为什么没回来。
It is ten thirty now.
II. 翻译下列句子。
It appears that he has made the same mistake again.
It is hot in summer and cold in winter in that city.
It is easy to understand why he has not come back.
Homework
1. Review the grammar we’ve learned.
2. Finish the exercises in Learning English.
3. Preview Speaking on page 58.