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《Using LanguageⅠ》最新PPT课件优质课下载
现在完成时的主动态:
主语+have/has+v过去分词
现在完成时 的被动语态(present perfect passive voice)：
S +have /has +been + done (过去分词)
1 Over time I have been changed quite a lot .
2 I have been used in offices and homes since the 1970s.
3 the mahine has been used for 3 years.
4 Since the 1970s many new applications have been found for me.
Discovering useful structures
在使用现在完成时的被动语态时要注意以下三点：
过去分词前有两个助动词 have / has 和 been。
2.什么时候使用has,have
3. 主语和谓语间必须是被动关系。
I have been told about it many times．
The bridge has just been built．
特别提醒
Workers have built the house since two years ago.
since two years ago.
how to change the present perfect active voice into passive voice(怎样将现在完成时主动语态变成被动语态)
The house
has been built
by workers
顺口溜：主变by的宾，宾变主，谓语变被动
1. We have received many letters since last week.
Many letters have been received (by us) since last week.