You need to point that example, because in Polish nie is most often before verb. Only if you clearly want to negate other word. (Jesteś nie chłopcem , lecz mężczyzną- You are not a boy, but a man)
But I think you may think about sentence like
Lew to nie (jest) tygrys.
There is no verb here. (if jest is ommitted), and you put "nie" after to.