I am confused between 'within' and 'upon':
Within/Upon my curiosity, I asked my fellow tutor who lives in the USA.
Which one is appropriate, within or upon? Could anyone explain why?
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Both sound weird to me as a British English speaker, although I'm not totally sure that I understand what you want to say.
I assume that you want something like one of the following:
As I was curious, I asked my fellow tutor, who lives in the USA.
Out of curiosity, I asked my fellow tutor, who lives in the USA.
I was curious, so I asked my fellow tutor, who lives in the USA.