外研版 (2019)必修 第三册Unit 3 The world of science课前预习ppt课件

这是一份外研版 (2019)必修 第三册Unit 3 The world of science课前预习ppt课件，共58页。PPT课件主要包含了invention，advance，Para 4，Para 12，structure，usage，Summarize，现在完成时，Structure，Usage等内容，欢迎下载使用。
Lessn 2 Using language Present perfect passive
Learning bjectives
1. Sum up the structure and usage f the present perfect passive thrugh discvering, analyzing and cmparing.2. Change sentences frm the present perfect active int the present perfect passive in the passage.3. Try t use the present perfect passive in different cntexts prperly.
Find ut sentences with the tw wrds belw.
1. There have been glden ages f inventin thrughut histry.2. Think f the fur great inventins in ancient China: gunpwder, papermaking, printing, and the cmpass.3. Then there were the great western inventins: the steam engine, the telephne and the radi.
Nw, reduced energy supplies and envirnmental pllutin have led t mre advances in the technlgy f new energy vehicles.
1.There have been glden ages f inventin thrughut histry.2. Nw, reduced energy supplies and envirnmental pllutin have led t mre advances in the technlgy f new energy vehicles.
Present perfect
Structurehave/has dne
Usage1.This tense indicates the actin that takes place in the past and cntinues t the present. 2. This tense indicates the actin that affects the present.
Present perfect passive
Dr Richard Fairhurst
If yu were an interviewer, hw wuld yu like t intrduce
Dr Richard Fairhurst has written a wrld-famus bk The New Age f Inventin.
What if yu were a bkseller? Hw wuld yu like t prmte this bk?
Lk at the sentences frm the reading passage and answer the questins.
a. I guess yu have been asked abut the title f yur bk befre.b. New inventins like 3D printers have been used t make replacement hearts and bne parts.
1.Can yu find ut the predicate f each sentence?
a. I guess yu have been asked abut the title f yur bk befre.
2. What has happened t “yu” in sentence (a)?
Smene has asked “yu” abut the title f yur bk befre.
I guess smene has asked yu abut the title f yur bk befre.
b. New inventins like 3D printers have been used t make replacement hearts and bne parts.
3. Wh has used new inventins t make replacement hearts and bne parts in sentence (b)?
Peple have used new inventins t make replacement hearts and bne parts.
c. I guess smene has asked yu abut the title f yur bk befre.d. Peple have used new inventins t make replacement hearts and bne parts.
passive frm
What is the difference between the tw grups f sentences?
Why des the authr use the passive frm in the reading passage?
The authr chses t use the passive frm instead f the active frm t emphasize what has been dne, rather than wh r what des the actin.
When d we use the passive frm?
a.强调动作的承受者，而不强调动作的执行者。All these prducts have been tested.b.不知道或没有必要说明动作的执行者是谁。Such bks have been written fr children. c.动作的执行者很模糊。The letter has been pened.d.有时为了礼貌的需要，避免说出动作的执行者。They have been tld many times nt t make nises.
1.把主动句的宾语变成被动句的主语。
2.把主动句的谓语变成被动语态形式。
3.把主动句的主语变为by的宾语，放在被动句的谓语之后，by短语可以省略。
A wrld-famus bk The New age f Inventin
has been written
Dr Richard Fairhurst.
Lk fr mre sentences with the passive frm instead f the active frm in the reading passage.
This evening, I’ll be talking t Dr Richard Fairhurst, whse new bk The New Age f Inventin has just been published.In additin, imprtant advances have been made in medicine and envirnmental science thanks t increasing cmputer pwer.I’ve als been tld that yu’re an inventr yurself.Nthing like this has been invented yet and I’d say we’re a lng way frm an inventin like that at the mment!
Summarize the structure, and the usage f the present perfect passive.
have/has been dne
a. 表示一个被动的动作或状态从过去开始一直持续到现在，常与 fr 或 since 引导的时间状语从句连用。The plan has been discussed fr nearly tw hurs.
b.表示一个被动的动作在说话之前已完成，强调过去的动作对现在造成的影响或结果，通常与 already, yet, just, never, recently等副词连用。The prblem has already been slved.
Read the shrt passage and answer questins.
Q1. What des this passage talk abut?
Q2. Hw has 3D printing affected ur lives?
Within the next 80 years, ur lives may be changed beynd recgnitinby 3D printing. It has already affected many things in ur lives, right dwn t the fd we eat. Fr instance, sme restaurants in Lndn have served 3D-printed hamburgers t custmers. But perhaps the mst significant success that peple have achieved t date is in medicine. They have made human bdy parts, including a beating hearts, with 3D printing technlgy. And it is nt just humans wh are benefiting —— in Brazil, peple have given anew 3D-printed shell t a turtle injured in a frest fire!
Within the next 80 years, ur lives may be changed beynd recgnitinby 3D printing.
Q2. What has been affected by 3D printing?
The fd we eat; medicine; the animals
Read the underlined sentences again.
Rewrite the underlined parts using the present perfect passive.
1. It has already affected many things in ur lives.
2. Sme restaurants in Lndn have served 3D-printed hamburgers t custmers.
Many things in ur lives
have already been affected.
3D-printed hamburgers
have been served
in sme restaurants in Lndn.
3. But perhaps the mst significant success that peple have achieved t date is in medicine.
4. They have made human bdy parts, including a beating heart, with 3D printing technlgy.
But perhaps the mst significant success that
has been achieved
is in medicine.
Human bdy parts, including a beating heart,
have been made
with 3D printing technlgy.
5. Peple have given a new 3D-printed shell t a turtle injured in a frest fire!
A new 3D-printed shell
has been given
t a turtle injured
in a frest fire!
Read the tw passages again and answer.
1. Which ne is better?
2. Why d yu think s?
Within the next 80 years, ur lives may be changed beynd recgnitinby 3D printing. It has already affected many things in ur lives, right dwn t the fd we eat. Fr instance, sme restaurants in Lndn have served 3D-printed hamburgers t custmers. But perhaps the mst significant success that peple have achieved t date is in medicine. They have made human bdy parts, including a beating hearts, with 3D printing technlgy. And it is nt just humans wh are benefiting —— in Brazil, peple have given a new 3D-printed shell t a turtle injured in a frest fire!
Within the next 80 years, ur lives may be changed beynd recgnitinby 3D printing. Many things in ur lives have already been affected, right dwn t the fd we eat. Fr instance, 3D-printed hamburgers have been served t custmers in sme restaurants in Lndn. But perhaps the mst significant success that has been achieved t date is in medicine. Human bdy parts, including a beating heart, have been made with 3D printing technlgy. And it is nt just humans wh are benefiting —— in Brazil, a new 3D-printed shell has been given t a turtle injured in a frest fire!
The secnd passage is better.
Because it highlights the change which 3D printing has made.
Dr Mre’s lab
What has happened?
Cmpare and describe
The rbt has been damaged.
The lck n the dr has been brken.
The windw has been brken.
Tw cmputers have been stlen.
Beakers and test tubes have been destryed.
The bk case has been pened,
and sme files have been taken away while thers have been thrwn everywhere.
Make a draft f yur phne call and act it ut.
Plice: This is 110. What can I d fr yu?Me: This is Susan. I am calling t reprt a burglary.Plice: Where is it?Me: It is in my schl. Dr Mre’s lab has been brken int. S much damage and lss have been made.
Plice: Anybdy hurt?Me: N. But … Er …Plice: Take it easy. Can yu describe the scene t me?Me: Er … The lck n the dr and the windw have been brken. The rbt has been damaged. Dr Mre’s tw cmputers have been stlen where there are a lt f imprtant dcuments stred.
The bk case has been pened, and sme imprtant files have been taken away while thers have been thrwn everywhere. Beakers and test tubes have been destryed and glass fragments have scattered all ver the flr… The lab is in a mess nw.Plice: Ok. I gt it. We will be there in a minute. Dn’t tuch anything please.Me: I am here waiting fr yu. Please hurry up.
Think and share.
What d yu learn frm this activity?
Keep calm when we are in an emergency.
Let’s check!
1. Knw the structure and usage f the present perfect passive.2. Can change sentences frm the present perfect active int the present perfect passive in the passage prperly.3. Can use the present perfect passive in different cntexts prperly.