must be的用法

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/14 05:35:17

must be的用法

简单说一下吧..
must be doing:肯定某人正在做某事..He must be doing his homework.他一定在做他的作业
must have been doing:肯定某人一直在做的事..He must have been trying his best to study..他肯定一直都在尽力学习..
must表强烈的肯定,shall不那么强烈,could最弱..表推测的情况一般不用can

must be的用法 must be和must的用法 must not be 的用法 must be与belong to 的用法 must be 几个用法的区别 must be的用法和意义 must跟must be的用法有什么区别? 关于must be,will be的正确用法 must not be 和 can not be 的用法区别 must be的用法和must have been的用法是什么? 有没must to be done这种用法的? should be could be must be will be 的用法及区别