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I've heard it at the movie It's called get rich or die tryin'
Between mon and her boy

Mom;Promise me that you gonna treat girls right
Son;All right mom

As for my quesiton Could mom have said like this
Promise me you to treat girls right

I guess if mom said like up Would it be a mistake sentence?
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That would be completely ungrammatical.

Promise me that you are going to treat girls right. = Promise me that you gonna treat girls right.

Why did you think an infinitive, "to treat," would work there?
Comments  
I guess I'm in error thanks you I'm getting it now