我以为她会听我的——我本该更懂事的。

I thought she'd listen to me - I should have ___known ___better.

两个成年人 surely 本该知道不该这样声嘶力竭地互相喊叫。

Surely two grown-ups should have ___known ___better than to shout at each other at the top of their lungs.

作为一位经验丰富的经理，他本该知道不该做出如此冲动的决定。

As an experienced manager, he should ___know ___better than to make such impulsive decisions.