5.4 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。 |