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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： http://yingyu.chazidian.com 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 | 
