回答
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I'll give it back someday.
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I'll return it someday.
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I'll return the money I owe you someday.
いつか someday
返す pay back, return
お金 money
借りたお金 the money I owe you
I'll give it back someday. I'll return it someday.
いつかお金(それ)を返すね、
I'll return the money I owe you someday.
あなたに借りてるお金、いつか返すね、