In the article "Two Coptic grammatical morphemes of unknown origin" Carsten Peust discusses the etymology of two Coptic morphemes whose origin has remained unclear until today. These are the n-prefix of the so-called adjective verbs and the particle ⲡⲉ, which often accompanies the preterite converter. It is suggested that both have arisen through a false segmentation of contexts in which their predecessors typically occurred. The use of these morphemes is a distinguishing criterion between Demotic and Neo-Egyptian Egyptian. [Extracted from the article]