释义：
know it (that) 知道
虽然这个表达不算是短语，但可以将之前提到过的事情取代为 it 或 that，变成 know that (it) 的形态，实际生活中经常会用到。
例句：
I didn't know that. But I thought you knew that.
我不知道，不过我以为你知道呢。
I didn't know you knew that.
我不知道你知道。
How do you know that?
你是怎么知道的？
对话：
A: You're not allowed to have drinks out here.
你不能把饮料带出去。
B: Oh, I didn't know that.
哦，我不知道。
