Foreign student : Excuse ME. You have GIVEn me the WRONG form.

Library assistant : Sorry, I gave you what you ASKed for. [irritated, appeals to others in the queue for support]

Foreign student : NO. IT IS the WRONG form.

Library assistant : OK. There's no need to be rude.

(capitalisation means the stress on it).

Since foreign student employed long stress, library assistant get angry.

If the stress falls on WRONG form, doesn't it just emphasise WRONG form? (Does it imply speaker's irritation if a speaker is native speaker?)

Then what about wrong FORM?
I am confused. What is all this? In a normal conversation, WRONG form would mean essentially the same as wrong FORM. It means that a different form is required – though the 2nd would be the first spoken and the 1st would be used in the 2nd attempt to communicate, I think. The speaker would be upset in either case.
really i cant understand what you have written...Emotion: smile
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I'm sorry, but my reply was for Moon, not you, Gloria. Do you understand his question?
Thanks for reading and answering the confusing question.

I just copied and typed the question from my book.

The stress in WRONG form.. as you guess is on WRONG and FORM in wrong Form. (cf, ASKed... not full ASKED but only on ASK)

Anyway, I think you gave me understandable answer; I think that's enough to understand the reason why native speaker in his last turn says '~ no need to be angry'.