1 used as the subject or object of a verb, or after a preposition to refer to the person or people being spoken or written to （用作动词的主语、宾语，或用在介词后面）你，你们: You can play the guitar, can't you? 你会弹吉他，是不是？I've told you about this before. 我以前已经跟你说过这件事。Bring your photos with you. 带着你的相片。

2 used with a noun, adjective or phrase when calling sb sth （与名词、形容词或词组连用，称对方为…）: You idiot! What do you think you're doing? 你这蠢材！你以为你在做什么？

3 used for referring to people in general （泛指）任何人: The more you earn, the more tax you pay. 钱赚得越多，税也纳得越多。 ☞ One has the same meaning but is much more formal and is becoming old-fashioned nowadays The more one earns, the more tax one pays. one表示相同的意思，但适用于较正式的场合，而且如今已渐渐变旧：The more one earns, the more tax one pays.钱赚得越多，税也纳得越多。