I decided to organize a one-day trip,cycling around Guangzhou.请问这里为什么cycle要用ing形式?

题目

I decided to organize a one-day trip,cycling around Guangzhou.请问这里为什么cycle要用ing形式?

答案

这里的cycling around Guangzhou是动名词词组作定语修饰前面的 trip,是一种非谓语动词形式