he must have read this book yesterday用完成?he must read this book yesterday?才对吧
问题描述:
he must have read this book yesterday用完成?
he must read this book yesterday?才对吧
答
两句的意思是有差别的
第一句是must对过去的肯定推测 翻译为:他昨天一定读了这本书
第二句是must的常见用法 本身有“必须 一定”的意思 ,含有责任 义务
。只能和现在时连用
答
he must have read this book yesterday
must have done
这是用来推测的.