What is your native language? I know that English is one of a only few languages where double negatives are improper. Also unless you plan to visit/live in the United States anywhere that isn't the Deep South you shouldn't really use "ain't".Oh my... now I think I am not even intermediate in English, but still just a beginner.
Hach...I find "ain´t" and those double negatiations sounding so nice... but oh well...
What means IPA?
TerokNor
http://en.wikipedia.org/wiki/IPA