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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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