问题描述： 现在完成时和过去完成时变为被动语态是怎么转变的?语法结构是? 1个回答 分类：英语 2014-11-03 问题解答： 我来补答 有例句吗?结构 have /has + 过去分词被动语态现在完成时：have/has +been +动词过去分词I have left my book at home.（ 被动）My book has been left by me at home.How long have you kept the book （ 被动）How long has the book been kept by you 展开全文阅读
