Some questions about Australian pronunciation...

Albert   Sun Dec 27, 2009 8:07 am GMT
Do Australian people use the past simple tense instead of present perfect in everyday speech? As far as i know , americans might say - (We already saw the film but they didnt see it yet.) . Is it correct and understoodable in australian english? And another one question is about the "O" vowel in NSW speech. is it close to british way of saying it?
Thank u in advance