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 UID94145 帖子2194 积分2526 学分15866 个 金币3 个 性别男 在线时间259 小时 
 
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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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