عنوان مقاله [English]
Baluchi is one of the new northwestern Iranian languages that has the most speakers in Iran and abroad, especially in Pakistan. The point that needs to be studied about this language and its comparison with the languages of the ancient eras is the conservativeness and efforts of some of its dialects to preserve the ancient features. The present study investigates the diachronic change of two short complex vowels /ai/ and /au/ as well as the vowel gradation process of ancient Iranian in the five dialects of Dalgani, Bazmani, Bompouri, Lashari and Zerbari, and its data, which is usually collected by field method, show that these vowels in the three more central dialects of Bompouri, Lashari, and Zerbari have often become complex vowels /iǝ/ and /uǝ/; also remnants of the process of ancient Iranian vowel gradation could be seen in these dialects. A diachronic examination of the complex vowels /iǝ/ and /uǝ/ in some Baluchi dialects indicates that these vowels were also complex vowels in ancient times, thus comparing these vowels with the passive Middle Persian vowels or the Modern Persian monophthongs, which some scholars termed "compounded", is inaccurate, and reminded once again of the need to pay attention to the diachronic studies of a language alongside its synchronic studies.