I know you are arriving next sunday .这句英语中arriving为什么要用ing 形式?请讲讲这方面的语法

I know you are I know you are always I also know,you are I know you are somewhere out there. I Know You are Not Alone sweetbox I know you are arrving next Sunday When will I know that you are When will I know that you are oh!i know.you are a I know you are sublimating.如何翻译? I know who you are意思 I know you are tired with me i know you are who.对么? i dont know who you are i know who you are,but what are you doing sorry,i don,t know.are you know? You know?you are man I hate you! You are my everything ,but i need you to know