should have done

基本解释

I knew I should have done beauty therapy.
我知道我本应该学习美容疗法。
Even if it’s something you should have done earlier in the week or missed a detail on.
甚至你在一个星期前的就提早完成了一件事或者忽略了一个小细节。
“The longer-ago regrets tend to focus on lost opportunities, things you could have done or should have done different, ” said Dr. Roese.
多年前造成的遗憾主要是因为失去了机会，即这些事情你本应该完成或者以不同方式去完成。

"I think it's a good thing, they probably should have done it a few weeks ago when they were saying it was the gas pedal and the floor mats."
So if in fact I wanted to make sure this was a number, I should have done something like either try and convert it to a number, which of course failed here, or put in a check to say where it is.
因此实际上如果我想确保,这是一个数字的话，我们的课程上的代码,在这里失败了，你或许应该在这里，放一个检查的东西。
麻省理工公开课 - 计算机科学及编程导论课程节选
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

I've had my share of their riches and fame, done things I never should have done.
NPR: Judy Collins, From Both Sides Now