Unit 4 Topic 1 When was it invented? Section D 课件(共25张PPT，内嵌音频) 2024-2025学年英语仁爱版九年级上册

(共25张PPT)
Unit 4
Amazing Science
Topic 1 Section D
学习目标
重点探究
自主学习
学习导航
当堂检测
课堂总结
拓展提升
新课导入
What is the GPS How does it work
学习目标
能熟悉并正确运用本课时的重点单词和短语
能归纳总结一般过去时的被动语态
能用英语谈论GPS的用途
自主学习
New words and expressions
explorer n. 探险者，勘探者
mark n. 标示；记号；符号
v. 做记号，做标记
system n. 体系，方法，制度
man-made adj. 人造的；非天然的
GPS is like a man-made star. We can use it at any time, in any place and in any weather to find out our position.
What is a GPS
The GPS is a great invention that helps us explore our planet and discover where we are.
重点探究
Passive Voice (Ⅱ)
一般现在时的被动语态 am/is/are +done
一般过去时的被动语态 was/were +done
The radio was invented by Guglielmo Marconi in 1895.
When was the digital camera developed It was developed in the 1970s.
Where was it developed
It was developed in Japan.
What is a rocket used for
It is used for sending satellites or spaceships into space.
I wish I could go into space some day.
I hope your dream will come true.
It’s said that he invented more than two thousand things during his life.
Inventing is interesting and exciting and everyone can be an inventor.
Functions
Where Are We
Where are we That was a big question when we first explored our world long ago. The early explorers found that the stars in the sky were good guiding marks. Using the stars, they could find out where they were and in which direction they were going. This method worked well at night as long as the weather was good and the stars could be seen. But it didn't work so well during the rest of the time. That was a problem.
Today, the problem has been solved by the Global Postitoning System(GPS). It is like a man-made star. We can use it at any time, in any place and in any weather to find out our position. It can also be used to study the shape of the earth. The GPS is a great invention that helps us explore our planet and discover where we are.
1) Using _______, they could find out where they were.
A. the sun B. the stars
C. the moon D. the earth
2) The Global Positioning System is like _________.
A. a man-made star B. a man-made sun
C. earth D. a circle
B
A
Read the passage and choose the correct answers.
Read the passage and discuss the questions on Page 88.
1. How did the early explorers know where they were
They found out where they were by using stars.
2. What’s the disadvantage of using the stars as guiding marks
Its disadvantage is that it didn’t work well when the weather
was bad and the stars could not be seen.
3. What is a GPS Is it useful to use
It is like a man-made star. We can use it at any time, in any
place and in any weather to find out our position. It is very
useful.
4. What do you think the GPS will be used for in the future
…
1. This is Kangkang’s invention. Look at the information and
the picture.What do you think of it Discuss with your
partners.
Name: Plar (plan-car)
Inventor: Kangkang
Year: 2014
Use: Both flying and driving
Project
2. Design your own invention. Draw a picture of it and write down the information about it.
Name :____________
Inventor:___________
Year:_____________
Use:______________
3. Show the picture of your invention and describe it to the class.
4. Discuss in groups to decide which is the most useful /interesting/funny invention.
Language points
拓展提升
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
被动语态结构：
被动语态由“助动词be+及物动词的过去分词”构成。（be有人称和数的变化）, 注意不同时态的不同形式。
eg: The classroom is cleaned by us every day.
The trees were planted by the students last year.
The olds should be taken good care of.
by many students.
1.Many students study English.
English
is studied
2.They made shoes in that factory.
Shoes
were made
by them
in that factory.
将主动语态变为被动语态方法: 原宾语变主语，动词变为be+动词过去分词， 原主语由by连接。
is spoken by
He speaks English.
English
him.
一般现在时被动结构：be(am/is/are )+ 动词的过去分词
一般过去时被动结构：助动词(was/were)+动词的过去分词
1.肯定句式 ：主语+was /were+v.-ed
2.否定句式 ：主语+was/were + not+v.-ed
3.一般疑问句式： Was /Were+主语+v.-ed
4.特殊疑问句式：疑问词W/H+was/were+主语+v.-ed
will是第一助动词，否定句，疑问句都围绕will进行变化。
e.g.
(1) He will be met at airport by his friend.
(2) Will an English contest be held next Saturday afternoon
(3) You will not be allowed to go out if you don’t finish your homework.
一般将来时被动结构：will be +动词过去分词
例：Nowadays, their materials have been changed so that it feels more comfortable.
主： He has finished his homework.
被： His homework has been finished by him.
现在完成时被动结构：have/has +been +动词的过去分词
by Amy.
Gina
can be taken good care of
2.You should drink more water.
More water
should be drunk
by you.
含有情态动词被动结构：can/may/must/should + be+动词的过去分词
1.Amy can take good care of Gina ．
注意：
1.主动语态中有些动词，如make, let, see, watch, hear等后面常跟不带to 的不定式作宾语补足语，但变为被动语态时要加上to。
如：I often see the old man run in the morning. → The old man is often seen to run in the morning. 我经常看见那个老人早晨跑步。
注意：
2.不及物动词happen, take place没有被动语态。
如：The traffic accident happened on Monday.这个交通事故发生在周一。
3. 某些表示主语的品质和状态、自身特征的不及物动词，如cut，sell，read，write，fill，cook，lock，wash，drive，keep等，常用主动形式表示被动意义。
如：The book sells well. 这本书卖得很好。
当堂检测
1. You are late, all the tickets __________(sell) out an hour ago.
2. This type of cellphone ____________(make) in Shenzhen.
3. I _____________ ( not invite) to yesterday’s party.
4. ______ those machines _________(check) this morning
5. Many trees and flowers _____________(plant) in our school
last year, and they made our school a beautiful garden.
were sold
was made
一、用所给词的适当形式填空。
wasn’t invited
Were
checked
were planted
课堂总结
归纳总结一般过去时的被动语态
用英语叙述GPS的用途
Unit 4 Topic 1
Section D