can't have been和can' have done有什么区别或者must have been和must hane done;may have been和may have done

问题描述:

can't have been和can' have done有什么区别
或者must have been和must hane done;may have been和may have done

can t have done 表否定推断,推测肯定没做.The measurement couldn t have been wrong.测量不可能出错了.He can t have been to that town.他根本不可能去过那座城市.He can't have taken it home.他不“can’t have...