Hi Flavia,
It means that someone is interested and enthusiastic in doing something.
Example: Joe was keen on the idea of a road trip.
Cheers, Lance
2017년 1월 31일
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On a personal level to be keen on someone means to fancy them, to want to go out with them
2017년 1월 30일
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To be keen on something means to be very interested on something. To put time, effort and interest on something that you like for example. You can be keen on learning languages.
2017년 1월 30일
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It can also means "to be interesed"
2017년 1월 30일
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It means to like something or be enthusiastic about it.