Regardless of the significant dialectal diversity, the Macedonian dialects are a unit and are noticeably distinct from the national dialects of Thrace, the Rhodope Mts., Mysia and the Balkan Mts. . . . . All of Macedonia can be divided into two dialect groups: the region to the west of the Vardar River and the southeast region of Macedonia. The second group includes also the dialects of Kostur (Castoria).
The western group is characterized by the following dialectal features: 1) three forms of the article, -ot (masc.), -ta (fem.), -to (neut.);
-ov, -va, -vo, -on, -na, -no; 2) third person singular present ending -t; 3) stress on the third syllable from the end; 4) the phraseological character of stress. The western Macedonian dialects are furhter divided into several dialect groups: Debar, Ohrid, central, Tikvesh-Mariovo, Veles-Skopje, Upper Polog and Lower Polog. Characteristic of the southeast dialects are: the pronouns on, ona, ono, oni; the preposition 505, etc.
The trying historical conditions experienced by the Macedonians have left their imprint on their culture. After the first imperialistic war (1914-1918) the greater part of Macedonia was joined to Yugoslavia. National oppression by the ruling Serbian bourgeoisie is exceptionally heavy. Serbian linguistic science, in the person of Belic, denies any right of self-determination to the Macedonian Slavs, claiming that the Macedonian Slavs are Serbs. On the other hand, Bulgarian linguistic science, which serves the purposes of Bulgarian imperialism, does not recognize the right of the Macedonians to independent national development. Southern Macedonia belongs to Greece, where there is also strong national oppression.