Hey guys! After learning correct English at the school, I started learning it by myself; by talking to natives, reading etc (etc means "and do son" so adding "and" we will have "and and so on''.
But what I did for training, mostly, was talking to natives, and they use a lot of abreviations, terms like Lemme, Gonna, Gotta. How right or wrong are they and how should I use ?
Ex: I gotta do this, or my mom won't lemme go. Thanks!
Generally we use abbreviations, slangs and lots of idioms when talking to/with informal people, and in informal environs.
Spoken English is by nature more informal than his writen counterpart. And there are some states, cities (New York, an instance of that) and countries (United Kingdom) that are more prone to informal communication.
There are professionals that have to use more standard and grammatical English (the military, professors etc). In the other hand, there are people in careers like singers, people that work with computers, gamers, and professional in careers where the young prevails.
So, it depends on the native you talk to, and wich type of interaction you have.