I'm gonna go = I'm going to go.
Gotta go. = I've got to go.
I wanna go. = I want to go. Thinking about this as I type, I think perhaps in addition to being lazy when talking, if one types with a few fingers, it is easier to type gonna, gotta, wanna than the correct form. But I find typing on the computer so incredibly easy compared to the old elec IBM I learned typing on in '71. And I used to think that was soooo fast compared to the non-electric ones they replaced. Perhaps it should be mandatory to learn typing skills in grade school and high school on manual typewriters and then everyone will really appreciate the cyber age and all that it has to offer. "Whatcha think?"(informal) or "What do you think? (polite and formal)
jrj

enthusiast

enthusiast