有一句话是she insisted on going there.为什么在这里不用insists on?

有一句话是she insisted on going there.为什么在这里不用insists on? He insisted on not going there. 英语语法动名词例句：Children insisted on their going there on foot我想问类 Mother insisted on my going with her. The children insisted---there on foot where are you going on vacation.这是一般将来时吗?为什么不用to?我知道going on (1).Tom is going to the movie___Jack insists on going swimmi She 这里是?on sunday morning Old as he was,he insisted on going with us he insisted on my going to see a doctor . work on it had begun before she left.这里为什么不用worked 不是过去发生的嘛 She insisted on doing the work herself 怎么改从句?