5.4 助动词have的用法
 
1)have +过去分词,构成完成时态,例如:
  He has left for London. 他已去了伦敦。
  By the end of last month, they had finished half of their work. 
  上月未为止,他们已经完成工作的一半。

2)have + been +现在分词,构成完成进行时,例如:
  I have been studying English for ten years.
  我一直在学英语,已达十年之久。

3)have+been +过去分词,构成完成式被动语态,例如:
  English has been taught in China for many years.
  中国教英语已经多年。





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