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Bulgarian demonstrates several linguistic innovations that set it apart from other Slavic languages, such as the elimination of noun declension, the development of a suffixed definite article (see Balkan linguistic union), the lack of a verb infinitive, and the retention and further development of the proto-Slavic verb system.
Bulgarian is closely related to Macedonian, generally recognized as a distinct language, although the prevalent opinion in Bulgaria, to some extent in Greece, and that of certain international linguists is that Bulgarian and Macedonian are two standard forms of the same diasystem.
Bulgarian verbs express lexical aspect: perfective verbs signify the completion of the action of the verb and form past aorist tenses; imperfective ones are neutral with regard to it and form past imperfect tenses.
Old Bulgarian (9th to 11th century, also called Old Church Slavonic) was the language used by St. Cyril, St. Methodius and their disciples to translate the Bible and other liturgical literature from Greek.
Bulgarian is the official language of the Republic of Bulgaria.
Bulgarian is the medium of instruction at all levels of education and is used in all electronic and print media.