1) insist on doing sth
例句:
She insisted on her mother's living with her.
I insisted on him going at once.
2) insist that S+ V (虚拟语气,表示一种建议)
例句:
She insisted that her mother should live with her.
He insisted that he should go at once.
3) insist that S+ V (陈述语气,表示一种事实)