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。