how to use subject/noun particles

What is the difference between 'yoja ga', 'yoja nun', and 'yoja ui' or others? I think that 'yoja ui' is possessive, but I don't know when to use ga or nun or if there are other particles.

Hi Jason, This lesson should help with how to use 가/이(ga/i) particles: http://members.rocketlanguages.com/lessons/972 As for the 는/은 (neun/eun) particles try reading this lesson: http://members.rocketlanguages.com/lessons/973 As for 의 (eui) you're right - it's possessive so 여자의 (pronounced yeoja-e) means "lady's". If you trouble with particles in general, try working your way through the Language and Culture lessons. There are plenty of examples and explanations. If you have any questions about them, just let me know. Good luck!