(共21张PPT)
B2U3 Learning about language
The Present Perfect
Passive Voice
现在完成时的被动语态
The development of the computer
calculating machine
analytical machine
personal computer / desktop
laptop
universal machine
huge computer
As is known to all, the computer is one of the most important inventions in the 20th century. Over time the computer 1 (change) quite a lot. It began as a calculating machine in 1642. Nearly about 200 years later, the machine was built as an analytical machine that could “think” logically. Later, a “universal machine” was built to solve mathematical problems.
Fill in the blanks according to the text :
has been changed
With time going by, the computer
2 (make) smaller, quicker and cleverer. First as a PC (personal computer) and then as a laptop. It 3 (use) in offices and homes from then on. In the early 1960s, computers were connected by a network. The information could be shared with others through the World Wide Web.
has been made
has been used
Since the 1970s, many new applications 4 (find) for the computer, and its goal is to provide humans with the life of high quality. Since its birth, the computer
5 (design) to serve the human race.
have been found
has been designed
1. Over time the computer has been changed quite a lot.
2. With time going by, the computer has been made smaller,
quicker and cleverer.
3. It has been used in offices and homes from then on.
4. Since the 1970s many new applications have been found.
5. Since its birth, the computer has been designed to serve
the human race.
Read and think: What is the same?
have / has + been + Vpp.
1. Over time I have been changed quite a lot.
Find out the same structures in the text on P18.
(Line 21)
(Line 28)
(Line 30)
(Line 1)
( Line 26)
(Line 17)
Over time
2. …… I have been used in offices and homes
since the 1970s.
Over time my memory has developed so much that
… I never forget anything I have been told.
4. Since the 1970s many new applications have been
found for me.
5. I have also been put into robots and used to make mobile phones …… .
6. I have even been put into space rockets and sent to explore the moon and Mars.
Since the 1970s
Over time
Since the 1970s
Discussion
When should we use the present perfect tense?
since the 1970s
over time
……
……
……
Pay more attention to the following time phrases:
Conclusion :
时间点 （eg. ... since the 1970s)
1. since +
S从 +V过 （eg. … since I came here)
the past / last few weeks / years
3. in
recent years
2. over time / with time going by
4. for + 一段时间
by now / up to now / so far
5.
recently / lately / already / yet
have / has + been + Vpp.
Conclusion :
be + V.pp
have/has + V.pp
V. pp
be
been
(not)
现在完成时
被动语态基本结构
现在完成时的被动语态
have/has + Vpp
have / has (not) + been +Vpp.
Practice:
eg. Computers have changed our life.
has been changed
Our life
(by computers).
1. They have finished the construction of the new
bridge by now.
The construction of the new bridge
_____________________ (by them) by now.
2. We have built a new library in our school this year.
A new library _________________ in our
school this year.
has been finished
has been built
Task 1:
3. My mother has taught me to be honest since I
was very young.
I __________________ (by my mother) to
be honest since I was young.
4. Car accidents have killed ten persons on this
road in the past few months.
______________ _________________ (by car
accidents) on this road in the past few months.
Ten persons
have been killed
have been taught
5. We have used the TCM (Traditional Chinese
medicine) to treat cancers for a long time.
_________ ________________ (use) to treat cancers
for a long time.
6. They have not finished the construction of the
new railway lines by now.
__________________________________________
_________________________ (not finish) by now.
has been used
has not been finished
The TCM
The construction of the new railway lines
Task 2:
Since 1958, they _______________________ (recognized) as the national theatre of Israel(以色列）. (2017 全国卷2)
Already this year, 115 measles (荨麻疹) cases _____________________ (report) in the USA. (2017 北京高考)
Despite the previous rounds of talks, no agreement __________________ (reach) so far by the two sides. (2015 天津)
Use a fire extinguisher (灭火器) only if you __________________ (train) to do so.(2018 天津卷 )
The problems of excessive (过度的) energy consumption, climate change and population growth ___________________ (describe) in a book by Thomas L. (2018 浙江卷)
have been recognized
have been reported
has been reached
have been trained
have been described
Since 1958
Already
So far
Discussion:
What has been changed in our school in the past few years?
A large playground____________________________
Our teaching-building _________________________
A new library ________________________________
A new smart dining hall _______________________
Several multifunction classrooms _______________
build
rebuild
decorate
construct
Put into use
Homework
假如你是李华，你的英国朋友Jim对中国的“新四大发明”(共享单车、高铁、网购和在线支付/支付宝)很感兴趣，特写信向你询问。请你给他回信,选一项新发明进行介绍。
注意：1.词数不少于100；
2.开头和结尾已给出,不计入总词数。
3.参考词汇： shared bikes, high-speed rail(way), online shopping,
E-payment/online-payment / Alipay.
Dear Jim,
Glad to hear from you. _______________________________________
______________________________________________________________
______________________________________________________________
Yours,
Li Hua
Homework
Finish the composition, please. You can both use the Present Perfect Tense and its passive voice. However, try to use the Present Perfect Passive Voice as much as possible, please !
