King Reza: Where I am from,, in new england, and especially in the far north east of new england in Maine, we are famous for not pronouncing our 'Rs'in many words.

For example the word 'car' is often pronounced as 'cah'
There is a good sentence we use.... 'Pahk your cah in havahd yahd' to illistrate this point!

Also the 'er' ending in words is often pronounced more like 'ah', as in mothah or fathah.
Anyway, just one more challenge for the non native speaker ;)