英文中的"someone"和"somebody"有無分別?

Someone　係指定一個人
Somebody 係任何一人

Someone asks me... (有一個人問我....)
Can somebody help? (任何人可以幫忙嗎?)

2007-11-20 00:06:27 補充：
用法有分別的。但亦好容易混淆。小心「anyone」 和「somebody」。

Some one and somebody are the same!

Did someone took my pen?
Did somebody took my pen?

Somebody:
某人,有人
Somebody wants to see you, sir.

Someone:
某人,有人
Are you expecting someone this afternoon?

Someone left this for you.

someone是重要人物,有名氣的人．．．
somebody是重要人物,有名氣的人．．．

無
someone is mean 某人,有人
Somebody also is mean 某人,有人