[shinkamalei]

mmk.
well for me, learning the difference between wa and ga were the hardest.
and wo is an object particle that goes with verbs.
but with wa and ga, they are both subject particles.
the way my teacher explained it to me is ga is more specific.
like you could say 'david-san wa gaijin desu' or 'david-san ga gaijin desu'
they both mean: david is a foreigner.
however, with ga, it usually means the other people around him aren't foreigners or he is the only one who is a foreigner in the group.
it specifies that its talking specifically about david only.
but its more of an implication rather than saying "only david is a foreigner."

did that help?