must be的用法

来源：学生作业帮助网编辑：作业帮时间：2024/05/02 23:43:12

must be的用法
must be的用法

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

You must be very happy.
你一定很开心
You must be Lucy.
你一定是露西
就是这样套进去

must be doing sth. She must writing.

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...

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