someone:某一个
anyone：任何一个人
某一个人可以做成某件事情,但是不是任何一个人都可以完成那件同样的事情
Someone in my class knows how to speak Spanish. 班里有个人可以讲西班牙语.
Anyone in my class knows how to speak Chinese. 班里的任何一个人可以讲汉语.
If anyone in my class knows how to speak Chinese, then you can always find someone in my class who can speak Chinese. 如果班里的任何一个人都可以说中文,那么你总会从我们班里找到个会说中文的人.
If someone in my class knows how to speak Spanish, it does not mean that anyone in my class knows how to speak Spanish. 如果班里有个人会说西班牙文,这并不代表我们班里的任何一个人都会说西班牙文.