The Present paper is an attempt to study and protect Persian dialects seem doomed to extinction. Tati is one of these dialects spoken by a few speakers in a village named Kal`asure near Kaleibar. Introducing Kal`asure, its geographical and human situation, people's life style, phonetic symbols and grammatical rules controlling noun and pronoun including gender, definition, number, agent, and verb agreement, singular or plural, noun cases, ergative, inflections are among issues presented in this paper. Post- Position is also dealt with in great details here. For each case, plenty of examples with their Farsi equivalent have been provided.