I suggest our going to the park on Sunday.go为什么加ing,xiexie

suggest doing sth 提议干某事
suggest one's doing提议让某人干某事( one's doing 是动名词复合结构作suggest 的宾语 )
I suggest our going to the park on Sunday=I suggest us going to the park on Sunday
记住没有suggest sb to do sth 这个搭配