摘要: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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