The unit of a grammar book I am using which focuses on the pronoun Y contains this example sentence: Il n'y en a plus. It is listed together with Il n'y va pas. and Je ne m'y intéresse pas. and according to the unit it illustrates the formation of negations with the pronoun Y. The last two sentences are pretty clear, but the first one seems to contain no pronoun Y. Since I don't consider myself advanced enough to doubt the information in the textbook I would be grateful if somebody can help me dispel my doubts. Does the sentence Il n'y en a plus. contain the pronoun Y? Or is Y part of the presentatif Il y a in this case?