how was everything going on 这个on 是什么词性?So,what's going on?里面的是介词还是副词?

how was everything going on? how is everything going? how is everything going How‘s everything going? how's everything是什么意思? How's everything going? how is everything? How's everything going? was interested in everything How's everything?的英语翻译 how is everything going with how is everything going 翻译 How is everything with you how is everything 怎么回答? How is everything的翻译 Mr.Bush is on the _____ for everything.How can it be that he was late for the opening ceremony? How is everything?1.Not at all.2.It was nothing.3.It doesn't matter.4.just so-so. how was everything going on 这个on 是什么词性?So,what's going on?里面的是介词还是副词?