someone的用法请讲得具体点.

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someone
[5sQmwQn]
pron.有人,某人 someone
[5sQmwQn]
pron.(=somebody)有人,某人
Someone wants to talk with you.
有人想和你谈话.
someone
[5sQmwQn]
n.不知姓名的人
Was that someone else aware of the accident?
另外那个不知姓名的人也知道这个事故吗?
要把它当单数对待 动词要用第三人称单数