In accordance with the latest classification of the Caspian languages (Gilaki, Mazandarani, Talysh and the Tati dialect group) as Central Iranian, a new non-case description of the grammar of Gilaki and Mazandarani is proposed, while confirming the traditional system of two cases in the Talysh language and in the Tati dialect group. In Mazandarani and Gilaki, instead of cases, a construction with a reverse ezāfe and a postpositional connection between the members of the phrase is proposed. A similar attributive reverse ezāfe construction in Talysh as an additional means of linking words is also identified and demonstrated. Differences in the case systems of some Talysh dialects, as well as within the Tati dialect group, are considered and analysed.