insist on 和 insist 不同之处：
意思上：
insist 的汉语意思可以理解成是：坚称,固执地认为某个观点或者信仰的意思,比如insist that the criminal must be punished.(他坚称罪犯应该受到处罚).
ininsist on 这个词,从它的on上就可以看出,这个词是包含有一种持续的含义的,所以在汉语中可以理解为坚持不懈地做某事.比如insist on doing excises everyday（他每天坚持做练习）.
用法上：
（1） insist on 是不及物动词用法,要接名词短语,
（2） insist (that) 是及物动词用法,要接从句.
例句：
（1）John insisted on paying for lunch today.
（2）John insisted that I let him pay for lunch today.
John insisted that he should pay for lunch today.