英语形容词副词问题

问题描述:

英语形容词副词问题
The research study reveals startling proof of a constantly changing seafloor that comprises the major part of the underwater landscape
句中为什么要用constantly?changing不是作名词吗?

change是动词,加上ing后既可以是动名词,也可以做形容词用的..
the changing times,不断改变的时代