(someone) is the one to (do something)
You can use the phrase "___ is the one to ___" to describe which person takes an action:
When we go out, he's always the one to pay.
I was the first one to speak.
You can use the phrase "___ is the one to ___" to describe which person takes an action:
When we go out, he's always the one to pay.
I was the first one to speak.
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