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
2017年1月31日
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On a personal level to be keen on someone means to fancy them, to want to go out with them
2017年1月30日
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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.
2017年1月30日
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It can also means "to be interesed"
2017年1月30日
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It means to like something or be enthusiastic about it.