few hours left till the sun's gonna rise的意思及语法现象,特别是be gonna(即be gone to )的

gonna是口头语,原本是Going to.
I'm gonna sleep = I'm going to sleep
I'm gonna study now = I'm going to study now
till是until的口头语
本文的语法不正确,是口头语文法.一般上,这种文法是美国南方各州教育程度较低的人士所用.
正确的全文应该是
There are only a few hours left until the sun rises.
There are only a few hours left before sun rise.
还有几个小时就天亮了.