pron.

1. 某人，有人
   Are you expecting someone this afternoon?

   今天下午你是不是等什麼人？

   Someone left this for you.

   有人把這留給你。

n.

1. 重要人物，有名氣的人
   If you had studied harder, you might have become someone.

   如果你當初學習努力的話，你或許已經成了重要人物了。

pron.

1. an unknown or unspecified person.
2. a person of importance or authority.