Subjects: I, you, he, she, who
Object: Me, you, him, her, whom
Possesive: My, your, his, her, who's
Pronominal
Adjective: Mine, yours, his, hers, whose
At least, I think that's right. I know when to use who's and whose, I just don't know if I put them in the right slots in this chart. Anyway, I haven't noticed you having problems with any of the other pronouns, so you intuitive grasp of grammar is probably okay.