admin百科知識 2022-02-13 18:45:27 請過路高人談一下must be doing 與 must have been doing 的用法.請過路高人談一下must be doing 與 must have been doing 的用法.這是在新概唸第九課出現的.這裡的 must 換成 shall 、could 、can 等意義上有什麽變化嗎?網友廻答：匿名網友簡單說一下吧..must be doing:肯定某人正在做某事..He must be doing his homework.他一定在做他的作業must have been doing:肯定某人一直在做的事..He must have been trying his best to study..他肯定一直都在盡力學習..must表強烈的肯定,shall不那麽強烈,could最弱..表推測的情況一般不用can ... db標簽 生活常識_百科知識_各類知識大全»請過路高人談一下must be doing 與 must have been doing 的用法.
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