One of the most widely-used prepositions, / be / in Persian and / pa / in Balochi, in the two Iranian languages of Persian and Balochi was phonologically and functionally (morphologically, syntactically, and semantically) studied in the present research. The methodology of research was based on a comparative-descriptive manner. It was found that Balochi, rather than Persian, has better preserved the older forms of the word by the retention of the phonemes /p/ and /a/. Functionally speaking, there were 24 cases of similarities against 10 cases of differences from a total of 34 cases in a synchronic study (almost 70% of similarities vs. 30% differences respectively). Not only can the results be used to provide a pattern for the comparison of other words of the two languages in order to provide language maps, educational comparative grammars, and teaching these languages; but they reveal that a revision is necessary in the typology system of Balochi dialects; especially for the dialects neighboring Persian. It means avoiding absolute classifying of all Balochi dialects as west-northern Iranian; since some of these dialects display many characteristics of west-southern Iranian languages as well.
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