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do与does与have的区别和用法

回答
瑞文问答

2021-09-09

have的用法:
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。

扩展资料

  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。

  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。