know的过去式： knew过去分词： known；
know：v.知道；知悉；了解；认识到；懂得；意识到；确信；确知；肯定；
第三人称单数： knows现在分词： knowing
I don't know what you're on about.
我不懂你在谈什么。
Well, what do you know? Look who's here!
唷，真想不到！你看谁来啦！
She of all people should know the answer to that.
在所有的人中，唯有她最应知道那个问题的答案。
You know I'll always be there for you.
你知道我将永远在你左右。
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