This is everyday, conversational English.
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going to = gonna
UPDATED: 3 SEPT 23
I'm gonna ....
He's gonna ...
I'm gonna go to Zurich next month.
She's gonna buy a new car next week.
He's gonna study Chinese.
It's gonna rain tomorrow.
You're gonna get sick drinking so much beer.
They're gonna eat at the Mexican restaurant Sunday.
We're gonna go to the movies tonight.
I'm not gonna, She's not gonna, ETC.