Acting: How do i put on an american accent?

not a really really american accent just to be able to put the american twang on certain words! i heard that americans speak from the middle of their mouths and their tongue hardly ever reach the top of their mouths. how do you do this? i have a subtle irish accent but i would like to act and most plays we... show more not a really really american accent just to be able to put the american twang on certain words!

i heard that americans speak from the middle of their mouths and their tongue hardly ever reach the top of their mouths. how do you do this?

i have a subtle irish accent but i would like to act and most plays we do have american backgrounds please give any hints and tips on how to put on an american accent!

thank you!
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