stick to persist in insist on

1.stick to :坚持原则,诺言,决定,计划,意见等 ,但是要注意它的后面只加名词,不加doingng
2.persist in :坚持行动,有时表示固执己见或坚持不改
Why do you persist in writing these things?
你为什么要坚持写这些东西呢?
3.insist on :坚持意见,主张 但是要注意它的后面可以接动名词,
He insisted on going there by bus