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You know about Andy, don't you?
你了解安迪，不是吗？
He didn't know how to begin.
他不知道如何开场。
I'm dying to know what happened.
我很想知道发生了什么事儿。
You know how prickly she is.
你知道她多么容易生气。
Do you know if he's married?
你知道他结婚了吗？