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《Grammar》教案优质课下载
Step1:Lead-in:
The computers have been used in communication , finance and trade.
The computers have been put into robots.
It has been used to make mobile phones as well as help with medical operations.
They have been put into space rockets and sent to explore the Moon and Mars.
Step2、认识结构
subject+ has /have been done
现在完成时的标志词：recently/recent years/these days/lately/since/for+时段/in the past few years/up to now/since then/so far/ever/never/yet/three times/already…
Step3、理解现在完成时被动语态的概念
现在完成时被动语态强调一个发生在过去的被动性动作，
有两层意思：
1）?动作已经完成，强调对现在造成的影响或结果：
?2）主语与谓语动词之间为被动关系。如：
?Our?classroom?has?been?cleaned,?so you?needn't?clean?it?now.
?These?flowers?have?been?watered,?so you?can?go?home.?
Step4、现在完成时被动语态的用法
1、用于不知道动作执行者是谁时: His?bike?has?been?stolen.?
他的自行车被人偷了。（不清楚是被谁偷的）
2、用于动作执行者是泛指或不言自明时:
Not a book in the library has been taken away. （没人拿书泛指）
3、用于可以说出动作执行者但动作承受者是谈话中心或特别需要强调时
My watch has been repaired. 我的表修好了。
（表修好了是谈话的主旨，是谁修好无关紧要。不必提及）
4、用于出于委婉、礼貌而避免提及自己或对方时
Enough has been said here on this question. 关于这个问题，这里已经谈得不少了。（意思是说：大家不要再说了）