A speaker or writer uses you to refer to the person or people that they are talking or writing to. It is possible to use you before a noun to make it clear which group of people you are talking to.
双语例句
例：
When I saw you across the room I knew I'd met you before.
当看到你穿过房间时，我知道我以前曾见过你。
例：
You two seem very different to me.
你们俩在我看来似乎很不同。
2.?你（在口语及非正式书面语中用以泛指人）
In spoken English and informal written English, you is sometimes used to refer to people in general.