If you make a promise, you should keep it.

如果你许下一个诺言，你就应该遵守它。

《柯林斯英汉双解大词典》

I told you we should have done it my way !

我跟你说过我们原本应该用我的方法来做这事。

《牛津词典》

"You should do it," the girl said, boldly.

这个女孩大胆地说道：“你应该这么做。”

《柯林斯英汉双解大词典》

Lincoln told southerners: "You think slavery is right and should be extended, while we think it is wrong and should be limited.

VOA: special.2009.07.16

But I don't think that it is very relevant if you think that it is better that a baby should die.

但我认为这与你的想法无关,无论你是否认为一个孩子的死亡是件好事。

普林斯顿公开课 - 人性课程节选

but if you explain it to your friend that you or she should not have or should have done something,

如果你想要向你的朋友解释，或者她应该做某事的时候，

I should have 课堂 - SpeakingMax英语口语达人

You should watch it, you might get a few more ideas.

FORBES: Connect

If it feels too crowded, then it is, and you should avoid it, Corbett said.

CNN: Be ready for emergency at a crowded public gathering

Iran is not a threat because we have said to other countries it is a threat and you should treat it as such.

WHITEHOUSE: Press Briefing