同学你好，该知识点来自沪江网校《【Uni智能】托福签95冲105分名师VIP-大学起点【现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
现在完成进行时有不同的强调作用，有强调过去到现在未完成的或者是暂时的事的用法，英语语法不是绝对的，毕竟是语言，我们一般学的语法只是归纳大部分，还是以英语解释英语为准
助助查到英语解释现在完成进行时如下：The present perfect continuous tense is used to talk about more temporary actions and situations; the present perfect tense is used to talk about longer-lasting or permanent situations.
比如：That boy has been standing at the gate for hours. (Temporary action or situation)
The temple has stood on the hill for hundreds of years.

希望可以帮到你~