Persian Language over time

Genesis of grammatical constituents and transition way of them is one of the most important problem in Linguistics. Persian language is the heritage of great land of Iran that studying the transition of its language «Persian» from the historical way is so valuable. The two volumes of «Persian language over time» are so valuable in transition way and process on grammatical constituents in Persian language. The frame work of these books is based on grammaticalization that is declared by its levels. Grammaticalization is based on frame work that is concerned to study of grammatical possibilitis¡ use and function of them (Nagzguy- Kohan¡1393:175). The main feature of this book is the arrage of it from the esiest one and the main one to the most complicated one. It is so good for readers who are not familiar in this subject.