问题描述: since引导的从句是什么时态 1个回答 分类:英语 2014-12-11 问题解答: 我来补答 可以是过去时也可以是过去完成时.如果是过去时它的从句用现在完成时,如果是过去完成时它的主句用过去时.如 It is /has been five years since he came here.(只有这种句型主句可用一般现在时代替现在完成时.) It was five years since he had come here. 展开全文阅读