ant they have used the words,' nie chce' for don't. i thought it was ' robi nie' an explanation please.
robie nie doesn't mean anything.
Polish doesn't use robić (do, make) as an auxiliary the way that English does.
In answering questions, you just use tak or nie or you repeat the verb from the question.
Chcesz piwo? (do you want a beer?)
Chcę. (I do, lit. I want)
Nie Chcę. (I don't)
Znasz go? (do you know him?).
Znam.
Nie znam.