Bouks wrote:Could someone explain the difference between the topic marking particle (eun/neun) and the subject marking particle (i/ga)?  It's not always clear to me why one is used rather than the other.  Actually, I can understand the use of eun/neun most of the time, but sometimes when i/ga is used, I wonder why eun/neun wasn't used instead.
No easy task...  like you, I'm sure I don't always understand when to use with one.
My nugget of help is that 은/는 is used to draw a contrast with something.  If everyone is introducing themselves and talking about their job/nationality/likes/dislikes etc, they will use 은/는.  It suggests that what they say is true for them, and is probably different from everyone else.
So I try to use 는/은 in those situations.
That's really all I can confidently say.  This is one of those things that doesn't have a counterpart in English, so it is really difficult for Korean-learners to fully get.  I'm sure whole doctoral dissertations are written on this topic.