Unit 7 Know Our World.Lesson 38 The World Is a Big Place.课件

课件29张PPT。Lesson 38
The World is a Big PlaceIs the world a big place or a small place?ThinkingAsia Seven ContinentsHow many continents does the world have?EuropeAsiaAfricaNorth AmericaSouth AmericaAustraliaAntarcticaHow many oceans does the world have?the Pacific Ocean the Indian Oceanthe Arctic Oceanthe Atlantic Ocean Four Oceans
planet
billion
total

increase
surface
Indian

Atlantic
Arcticn. 行星n. 十亿；千兆n. 总计；总数adj. 总的；总计的n. 表面；表层v.增加；增大adj.印度的n. 印度人n.& adj. 大西洋（的）adj. 北极的New words[’bili?n][’pl?nit][’t?utl][in’kri:s][’s?:fis][’indi?n][?t’l?ntik][’a:ktik]Read and learnDo Part One in the books.An increasing population is a problem for the earth!How many people are there in the world?
In the year 2010, the world's population was over 7 billion in total.
By 2025, the world may have about 8 billion people.
By 2050, the world’s population may reach 9 billion.high mountainssnow and icePeople can’t live everywhere on the earth.We can’t live __________, and only about ____________________ is land. But parts of this land are _____________. These dry places _________________. Some areas have __________________. Others have ____________ and ________. It’s not easy ___________________. in water one third of our planet very dry are called deserts very high mountain a lot of snow ice to live in those places Antarctica penguinSix of the seven continents are for people to live on!There are ________ continents in the world. They are _____________________ __________________________________________________________________.
Antarctica is __________________________ all year round. ________, people can live on ________________________. On these continents, there are __________________ ________________and ____ _____________.seven covered with snow and iceLuckilythe other six continents green forests fresh water rich landsThe earth has ________________, but we use these name ___________________.
They are ___________________________ ___________________________________ ____________________.
_______________ is the largest one.Two thirds of the earth’s surface is covered with oceansThe Pacific Ocean only one big ocean for its different partsWe should treat the earth well!The earth is __________ now, and it will be _________ in the future.
It must _______________ for our children and for our children’s children, too. our home our home be treated well面对一个大问题
总和
迅速增长
世界人口
---的三分之一
地球表面的 三分之二
被称为
被覆盖
用---于---
被好好的对待
在其他六个大洲上
face a big problem
in total
increase very quickly
the world’s population
one third of -----
two thirds of the earth’s surface
be called ---
be covered with ----
use --- for 被用于 be used for
be treated well
on the other six continents介词by意为“到……为止”。如果后面接表示将来含义的时间，句子用一般将来时；如果后面接表示过去含义的时间，用过去完成时。
By 2015, a lot of new buildings will be built in Beijing.
到2013为止，将有许多的新建筑在北京建成。Language points分数表达法分子是基数词而分母是序数词（分子大于1，分母加s）
例：two -thirds 或 two thirds
分数或百分数加of后的名词作主语，
1. 如果of后是单数可数名词,不可数名词或数词,谓语动词用单数。
2. of后的名词是复数可数名词，谓语动词用复数。
例：1.Only about one-third of our planet ___land.
我们星球只有大约三分之一是陆地。
2. In our class, two thirds of the students _____girls.
我们班三分之二的学生是女生。isare 注意
1、a half 也可以用来表示“二分之一”
2、a quarter 表示“四分之一”
3、three quarters 表示“四分之三” dry--drier--driestdesertThese dry places are called deserts.The passive voice
被动语态语态：表示主语和谓语动词之间的关系。
英语有两种语态，即主动语态和被动语态。 主动语态：表示主语是动作的执行者。被动语态：表示主语是动作的承受者。
如：
Many students study English.(主动语态)
English is studied by many students.
(被动语态)语态by many students.1.Many students study English.Englishis studied2.They make shoes in that factory.Shoesare madeby themin that factory.1.一般现在时的被动语态结构：
is/are+过去分词They play football on Sunday.
Lucy does the homework in the evening.
They often use computers in class.
We make these machines in Beijing.
Football is played by them on Sunday.The homework is done by Lucy in the evening.Computers are often used by them in class.These machines are made in Beijing.2.含有情态动词的被动语态结构：can/may/must/should + be+过去分词1.Amy can take good care of Gina ．by Amy.Ginacan be taken good care of2.You should drink more water.More water should be drunkby you.1、be covered with… 被……覆盖
2、luckily 幸运地
unluckily 不幸地
例：He fell off the motorcar. Luckily, he wasn’t badly hurt.
他从摩托车上摔下来。幸运地是，他伤得不重。Language points常放在句首luck
n. 运气
lucky
adj. 幸运的，既可以作表语，也可以作 定语。
例：Good luck to you!
祝你好运！
He is a lucky dog.
他是个幸运的家伙。The differences between in future & in the futurein future = from now on 今后,从今以后
e.g. "I hope they'll be more cautious in future, " he said.
他说："我希望他们今后能更慎重一些。”
in the future 在将来、未来，侧重较长远的未来
e.g. The boy wants to become a philosopher in the future.
这个男孩想在将来成为一名哲学家。summary