Quote:
Originally Posted by chryuop
Why not 野球をできる?
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Because potential forms should take が.
I can't tell you exactly
why it has to take が if that is what you want to know.
All I know is that you express potential with が.
Edit:
I hope I didn't mis-understand you; When I wrote the above, I was under the impression you wanted to just know if をできる was correct.
But now I have re-read it, I think you want an explanation of the linguistics (If that is the right term to use)