The study of evolution of adverb in ancient Persian, Middle Persian and Persian Dari

Adverb is one of the complicated and challenging issues of grammar. It is one of the most important discussions of language that hasn’t been known until now, and there is no accurate and comprehensive definition of it. Also definitions available aren’t complete and classified, and its dimensions weren’t studied by the most grammarians .
It wasn’t historically and evolutionally studied until now. Based on this, the purpose of present study is to investigate adverb differently, so that historically studied it and show its structural evolution inancient Persian, Middle Persian and Persian Dari using many examples.
The obtained results show that there is close relationship between Dari Persian and Middle Persian and this relationship result that most of Persian adverbs beevolutional forms of Pahlavi Persian (middle).