I know so few, but I like to read these quizzes even though I don't usually answer so I will answer the few that I do know (or think I know rather =P)
らんない -> られない
ボクんち -> ぼくのうち
田中んち -> 田中のうち
やっぱ -> やっぱり？
もん -> もの？
I didn't look at any other posts yet, so these have probably been answered already but I will answer again anyways
