释义：

be the one who ... 某人是……的人

属于一种强调的用法，表明“某人才是……的人”。比如说，想要表达“是我做的”时，可以用 I'm the one who ... ，“是你做的”时，可以用 You're the one who...。

例句：

I'm the one who made him quit smoking.
是我让他戒烟的。
You're the one who ended it, remember?
是你终结的，记得吗？
I guess he's the one who needs a job right now.
我记得他是最近急需找到工作的人。
She's the one who agreed with you!
她就是同意你的人！

对话：

A: Pat is going to be fired from our workplace.
帕特要被开除了。
B: I don't want to be the one who tells her.
我可不想告诉她。