Gonna is not a standard contraction and should be avoided in writing. I don’t understand your sentence.
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mizansinha007I am gonna school.This is wrong. Gonna can’t replace going to there. You could say, however, I am gonna [going to] go to school.
mizansinha007"I am going to wait for Tina." Can I say this thus? "I am gonna wait for Tina."Yes.
mizansinha007Can I
mizansinha007Is it right 'Now I am gonna be waiting for tina' I am happyHowever, it is wrong when used, for instance, here at EF, or wherever standard English is expected.