عنوان مقاله [English]
During the life of Persian language, from Ancient Persian to Dari Persian the changes of the phonemes to each other has been frequently occurred. An example for such an evolutional change is conversion of phoneme “t” to “dh” and thereafter to “d”. The Phoneme “dh” which is specific to Persian words is called “dhāl mojama” or “Persian dhāl”. There are some rules to pronounce it such as: the previous letter in this case was soundless and of course not one of vowels “a,w” and “y” will be pronounced “d”, otherwise it must be pronounced “dh”. In the present article, it is indicated that “dhāl mojama” occurs in many words of Nasāg dialect. In addition, it is discussed that, though, in most cases, “Persian dhāl” is settled in the middle or end exceptions in which “dh” appears at the beginning or after a soundless letter. This result is not compatible with the claimed rules for “dhāl mojama”.