Regret is lost
知───know;后悔───regret
I hardly know you.───我几乎不了解你。
All the actors know the play backward.───所有演员对剧本都熟知到可以倒背如流.
I don't really know, I'm just guessing.───我真的不知道, 我仅仅是猜想.
These women electricians really know their job.───这些女电工真能干.
Under the circumstances I feel it right that you should know.───在目前情况下,我觉得让你们知道是对的.
His secret died with him, and now we shall never know the truth.───他的秘密随他一起离去, 现在我们永远也不可能知道真相了.
I know you better than him.───我对你比对他更了解.
It is very useful for a person to know how to swim.───对一个人来说会游泳是很有用的.
They know me-I'm a regular customer.
Know your own faults before blaming others for theirs.
Know something like the palm of one's hand.
To know one's self is true progress.
To ask well is to know much.