现在完成时的被动语态 (31PPT)

economy [ɪ'kɒnəmɪ] n. 经济；节约；理财
Some factories have been set up(set up) to improve economies.
The road has been widened ___________________ (widen).
dust 灰尘 bin 箱子，容器； ['dʌstbɪn]
现在完成时 强调一个发生在过去的 动作持续到现在或对现在造成的影响或结 果。 其构成是: have/has been + done。例如：
1. The dirty clothes have been washed.
脏衣服都已经洗了。
2. The plan has been studied by the experts for three times.
1.Great changes have been taken place in my hometown.
2. Many measures (措施) have ∧taken. been 3.Citizens have been request not to throw rubbish and litter everywhere. requested 4.The number of cars have been limited to reduce our pollution. has 5.More and more people has sensed the importance of the environment protection. have 6.People have became responsible for building a beautiful hometown. become
3.The door has been closed. 4.The windows have been opened. 5.The floor has been cleaned.
注：现在完成时 现在完成时表示动作发生在过去, 到现在 已经完成或对现在仍有影响。
past
present
future
already，so far，yet，lately/recently， these days/years/weeks，since+时间点，for+时间 段等。
这项计划已经由专家研究过三次了。
Practice I
Can you make more sentences, using “have/has been done” ?
?
Tall buildings have been built (build) everywhere.
have been built Shopping centers (build).
Tall buildings have been built (build) everywhere as well as shopping centers.Also some factories have been set up (set up) to improve economies.Roads have been widened (widen).In order to keep the city clean and tidy, many measures have been taken (take).
Citizens have been requested (request) not to throw rubbish and litter everywhere. Therefore, more dustbins have been placed (place)on the streets. More and more trees and flowers have been planted (plant) on the hills and either side of the roads.
ຫໍສະໝຸດ Baiduhave been placed More dustbins ( place)on the streets.
More and more trees and flowers have been planted( plant)on the either side of the roads.
Tall buildings have been built (build) everywhere.
基于情境的英语语法教学
第十一章 动词的语态
guessing game What has changed in the classroom?
have / has ＋ been＋done(过去分词)
1.The lights have been turned off. 2.The blackboard has been cleaned.
have been placed More dustbins ( place)on the streets.
More and more trees and flowers have been planted( plant)on the either side of the roads.
Practice II：Correct the sentences
have been built Shopping centers (build).
Some factories have been set up(set up) to improve economies.
The road has been widened ___________________ (widen).
I used to live in a small town with trees around. There were no tall buildings and the streets were narrow. But in recent years, great changes have taken place (take place) in my hometown.