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《Learning about Language》最新PPT课件优质课下载
Over time my memory has developed so much that, like an elephant, I never forget anything I have been told!
Since the 1970s many new applications have been found for me.
I have also been put into robots and used to make mobile phones as well as help with medical operations.
I have even been put into space rockets and sent to explore the Moon and Mars.
现在完成时的被动语态表示某个被动的动作发生在过去,对现在 造成了结果和影响；或者某个被动动作从过去开始，一直持续到现在，对现在造成了结果和影响 。
现在完成时的被动语态
The new school has been set up.
新学校已经建成了。
The machine has been used for years.
这台机器已经被使用了数年了。
1. 现在完成时被动语态的肯定式为：
have / has + been + done
The experiment has been done successfully.
这个实验做得很成功。
现在完成时被动语态的否定式为：
have / has + not + been + done
Tom’s novel has not been published.
汤姆的小说还没有被出版。
现在完成时被动语态的一般疑问句需将have / has提到主语的前面。
Has his bike been repaired?
他的自行车修好了吗？
现在完成时被动语态的特殊疑问句为：疑问词 + have / has + been + done
Who has been invited?
谁受到了邀请？
现在完成时的被动语态通常有以下两种情况：