The characteristics you ask about are fairly common in some areas of the US - dropping the G from ing and the D from and especially. The your to yer is more Appalachia on out to American Western. The oddball in your group is the you to yeh - not common. In the south it would be you-all (y'all), In the hill belt out to the west it would be youse (if possessive or plural). I think what you may be getting at is the "Can I come with ya." which is again, fairly common. Overall, I'd say your examples (with the ya on the last one) could be quite a few places - Midwest, Appalachia, Plains, far West. It would be considered regional dialect but would also be quite acceptable in historical dialogue set in those areas. Puma