I mean to say, you should have known how he would react!

我的意思是说，你本应料到他会作何反应！

《牛津词典》

If I had known the exercises should be handed in today, I'd have finished them yesterday.

如果我知道今天要交练习题，我昨天就会把它们做完了。

youdao

I should have known earlier.

我应该早点知道这些。

youdao

"I don't think America should be known for 'we could kill more people than any other nation.'

VOA: standard.2010.06.29

Some of the things I said--you'd probably say, well I should have known that an insurance company would have to do that, but it isn't.

对于我说的一些东西，你可能会说，我早就知道,保险公司会如此操作，但事实并非如此。

耶鲁公开课 - 金融市场课程节选

I should have known better.

我早该知道的。

I should have 课堂 - SpeakingMax英语口语达人

Amazing to think that I lay awake worrying about him, when I should have known in my silly heart that I was for the chop.

NEWYORKER: Hand on the Shoulder

After decades of work in radio, music and popular culture, I should have known better.

FORBES: Tribune's Lee Abrams Defends Himself: "I Will Not Stop Pushing"

Mr. RONNIE HOLMES (Firefighter): I think they should have known better.

NPR: Responsible Consumers Decry Mortgage Bailout