题目

i regret that i have to notify you of so many orders being cancelled at the same time.
为什么be要加ing,这是被动语态的什么时态

提问时间：2020-12-06

答案

你好.在介词of後面的动词是动名词形式,这个动名词是被动语态形式.
== - - - of so many orders' being cancelled --------注意： -- - s’ + 动名词