Visiting Shanghai中的“Visiting”是什么词

Visiting Shanghai中的“Visiting”是什么词 Mary is visiting Shanghai museum .(对visiting Shanghai Museum visiting professor He is visiting in Japan 是什么时态 Did you have a good time visiting Canada?中的visiting为什么是ing形式 visiting scholar和visiting student什么区别 My parents are now visiting my sister.是什么结构? Visiting the Summer I am visiting my visiting faculty member visiting的意思? visiting啥意思