I live in Germany where I often hear 'I gonna' or 'you gonna', in effect treating 'gonna' as a main verb and missing out the copula 'to be'. AAE also has a 'zero' copula. Perhaps this clitic will be dropped in all spoken Englishes in the future. For the moment, I was wondering where the confusion might lie.

1) Is there a phonological reason behind dropping the clitic? 

2) Is this a German-speakers' phenomenon? 

3) Are some forms (e.g. questions, 'you gonna come?') closer to a standard?