Decreolization or the Post Creole Continuum
Some examples from the Caribbean

The Jamaican Continuum
 

    Acrolect        It's my book        I didn't eat any

    Mesolect        Iz me buk            A in nyam non

    Basilect         I fi mi buk dat      Mi na bin nyam non
 
 

Guyanese pronunciation of "I told him."

 
            Standard English

                                Creole
 
 

Guyanese pronunciation of "I gave him one."

Standard English

Creole