You should know better than to behave like that.

你应当明白事理，不该那么不懂规矩。

《牛津词典》

She of all people should know the answer to that.

在所有的人中，唯有她最应知道那个问题的答案。

《牛津词典》

Granted, he is a beginner, but he should know the basic rules.

的确，他是个初学者，但基本规则他应该懂啊。

《牛津词典》

He says international students should know that this can affect them in the future if they try to re-enter the United States.

VOA: special.2009.04.02

Right. I would say as I reflect back on my college experiences and those listening in the audience should know, I graduated from college 45 years ago.

的确如此，可以这么说,当我回想我的大学生活的时候,想必听众中有人知道，我45年前就从大学毕业了。

普林斯顿公开课 - 人性课程节选

You know like, I should know about restaurants more,

我好像应该很了解餐厅，

唐人街的美食 - SpeakingMax英语口语达人

There is little question that people living in America should know how to speak English.

CNN: Why it's good to speak Spanish in America

He should know--he was a 20-year veteran at Lego who was laid off in 1997.

FORBES: Copenhagen Capitalism

They should know something like this will only bring us together and make us stronger.

NPR: 2 min 45 sec