should have done

基本解释

I knew I should have done beauty therapy.
我知道我本應該學習美容療法。
Even if it’s something you should have done earlier in the week or missed a detail on.
甚至你在一個星期前的就提早完成了一件事或者忽略了一個小細節。
“The longer-ago regrets tend to focus on lost opportunities, things you could have done or should have done different, ” said Dr. Roese.
多年前造成的遺憾主要是因爲失去了機會，即這些事情你本應該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.
因此實際上如果我想確保,這是一個數字的話，我們的課程上的代碼,在這裡失敗了，你或許應該在這裡，放一個檢查的東西。
麻省理工公開課 - 計算機科學及編程導論課程節選
but if you explain it to your friend that you or she should not have or should have done something,
如果你想要曏你的朋友解釋，或者她應該做某事的時候，
I should have 課堂 - SpeakingMax英語口語達人

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