okay, the thing is ... no matter how you pronounce can't, you
still won't be able to CLEARLY differentiate it with can.
can't (rhyming with pant) is the american pronounciation.
if you're american, you will also happen to pronounce can
"k-anne".
if you're british or you use british pronounciation (TIP: it's said
to be more "accurate" and "standard" in comparison to american
english, though I still stick with the american way of saying
things), it's cAHn't
but you'd pronounce "can" cAHn too.
so .... either way, it's still hard to differentiate can and
cant.