egypt-museum:

“Ancient Egyptian is commonly divided into five historical stages, known as Old, Middle, and Late Egyptian, Demotic, and Coptic. Significant differences in grammar separate the first two of these from the last three, so that the stages can be grouped into two major historical phases, Egyptian I and Egyptian II. 

Old Egyptian can be said to begin with the first known instance of a complete sentence, from a cylinder seal of the pharaoh Peribsen, near the end of the 2nd Dynasty. Prior to this, the language is represented solely by proper names, titles, and labels. 

Some of the latter, however, contain phrases, demonstrating the existence of several grammatical features that characterize the later language: in this case, nisbe formation, adjectival modification, nominal verb forms, and genitival relationships expressed by direct juxtaposition, including that between a verb and its subject and consequent vs word order.”

― The Ancient Egyptian Language: An Historical Study, by James P. Allen