概要：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。
小升初必备语法：助动词have的用法,标签：小学英语语法大全,http://www.85jc.com1)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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