Unit 3 The world of science
Using language(Grammar)
Present perfect passive(现在完成时的被动语态)
Learning objectives(教学目标):
At the end of the class, you’ll be able to:
1. Learn to identify Present perfect passive.
2. Understand the basic knowledge about Present perfect passive .
3. Write sentences using the Present perfect passive.
课前预习案
Ⅰ.Words and expressions
1.beyond
2.within
3.affect
4significant
5.appropriate
6.physicist
7.mathematician
8.chemist
9.astronomer
10.geographer
11.biologist
12.accurate
13.for instance
14.be named after
15.origin
16.along with
17.extraordinary
18.be regarded as
19.brilliant
20.mental
21.the number of
22.cure
课中探究案
Activity1.Lead-in
1.Fill in the blanks according to the interview.
Richard’s new book The New Age of Invention (publish). Nowadays, important advances (make) in medicine and environmental science thanks to increasing computer power. New inventions like 3D printers (use) to make replacement hearts and bone parts. As for the time machine, Richard thinks nothing like this _______________(invent) yet . .
2.What is the tense made up of (由...组成)
Present perfect(现在完成时) have/has done
Passive voice(被动语态) be done
Present perfect passive(现在完成时的被动语态) have/has been done
Activity2.Discovering the rules
Compare the following two groups of sentences and answer the questions.(Page38.1)
Question1.What is the difference between the two groups of
sentences
Question2. Why does the author choose to use the passive form
instead of the active form in the reading passage
Activity 3. Studying the rules
1.When to use the Present perfect passive
(1). 不知道或者没有必要说明动作的执行者是谁;
Such books have been written for children.(已经为儿童编写这类图书了。)
(2). 强调动作的承受者,而不是动作的执行者;
All the products have been tested.(这些产品都经过测试了。)
(3). 动作的执行者很模糊;
The letter has been opened.(这封信被人拆开了。)
(4). 有时候为了礼貌的需要,避免说出动作的执行者。
They have been told many times not to make noises.(已经有人多次跟他们说别那么大声了。)
2.How to use the Present perfect passive
(1).表示被动的动作在说话之前已经完成,强调过去的动作对现在造成的影响或产生的结果,通常与already,yet,never,recently等副词及时间状语so far,by now,up till/to now,since等连用。
The database has already been updated.
数据库已经被更新了。(现在可以使用新的数据库了)
(2).表示一个被动的动作或状态从过去开始一直持续到现在,并可能继续持续下去,常与for或since等引出的时间状语(从句)连用,或用于how long引出的句子中。
The machine has been repaired for two hours.
这台机器已经被修了两个小时了。(可能还会继续被修)
(3).用在条件状语从句中,表示将来某时已经完成的动作。
You shouldn’t leave school before your homework has been finished.
在你的作业没完成之前你不应该离开学校。
(4) .不及物动词(词组)如 happen, take place, die, appear 没有被动语态,而不及物动词加介词或者副词构成的短语,相当于及物动词,可以用于被动语态。注意介词和副词不能丢掉。
The child has been taken good care of by Grandma Wang all these years. 孩子们这些年被王奶奶照顾得很好。
(5). 非持续性动词(瞬间动词),如 come, go, start, begin, leave, arrive, reach, get, marry, die等现在完成时的被动语态不能和表示一段时间的状语连用。若要表达相应意思,需改变动词或时态。
The new car has been kept for a month.(buy)
How long has the meeting been on (begin)
Activity4.Applying the rules
Task1.Rewrite the underlined parts using the Present perfect passive(Page38.2)用现在完成时的被动语态改写句子
1.It has already affected many things in our lives.
2.some restaurants in London have served 3D-printed hamburgers to customers.
3.But perhaps the most significant success that people have achieved to date is in machine.
4.They have made human body parts , including a beating heat, with 3D printing technology.
5.People have given a new 3D-printed shell to a turtle injured in a forest fire!
Task2.Imagine you are Dr Moore. Look at the pictures and tell the police about the damage and loss to your lab. Use the present perfect passive where appropriate.(Page39.3)
In the morning, when I went into my lab, I felt extremely surprised. What a mess it is now! My lab _____________ (break) into. The only robot at the door _____________ (push) down into pieces. The door of the cupboard was open. Some chemical apparatuses such as test glasses and tubes _______________ (knock) over. In addition, my papers on the desk ________________ (turn) in disorder.
1. The lock on the door has been broken.
2. The window has been broken.
3. My two laptops have been stolen.
4. Beakers and test tubes have been destroyed.
5. The book case has been opened, and some files have been taken away while others have been thrown everywhere.
6. The robot has been damaged.
Activity5.Practice the tense
1. Great changes________________(take place) in my village since 2012.
2 .More patients _____________(treat) in hospital this year than last year.
3. _______ the photo______________(develop) yet If not, you`d better get it ready as soon as possible.
4 .--Are you going to the party
--No, I _____________________(not invite) yet.
5. More than 5000 used bikes __________________(collect) since the two brothers set up the organisation.
6. Every possible means _______________(try) to stop the bad behavior, but they don`t work at all.
7. Over the past ten year, this town __________(hit) twice by earthquakes.
8. ---Will the lecture be held at 4 o`clock this afternoon
---No, it __________________ (put off ) till tomorrow.
9. ---What happened to the postman
---I don`t know. He ________________(not see) around
here for a long time.
Activity6.Homework
Try to to write five different sentences by using present perfect passive.