In recent descriptions of Danube-Bulgar language was pointed out that what survived from it was a "lexicon", a merely list of words(1). In fact, two major monuments of this language, Nominalia of Bulgarian princes and Preslav inscription does not possess any grammatical futures(2). What does this mean? Language have two main properties, vocabulary and grammar. Without grammar a language must be considered dead. When did this happened? Preslav inscription cannot be dated precisely, but Nominalia of Bulgarian princes might have been created shortly after 766 when was 40 days rule of Khan Umor. Did then Slavic(3) completely replaced Danube-Bulgar by that time? In this article will be presented and analysed four inscriptions from Early Medieval Bulgaria that give answer to this question. All of them come from same area: three of them was found in Silistra and the fourth in vicinity of nearby village Garvan. First three inscriptions, foun...