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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: 
  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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