In Bulgarian grammar, the theory of articles plays a crucial role in understanding the usage and function of definite and indefinite articles. Articles are used to indicate the specificity or generality of a noun in a sentence.

Bulgarian has definite articles, which are used to specify a particular noun, and indefinite articles, which suggest a more general or non-specific noun. Definite articles are attached to the end of the noun and agree in gender, number, and case. Indefinite articles, on the other hand, are separate words that also agree in gender and number.

The definite article in Bulgarian has three forms: “ът”, “та”, and “то”. The choice of which form to use depends on the gender, number, and case of the noun. For example, “моят приятел” (my friend) and “моите приятели” (my friends) show the agreement between the definite article and the noun.

In contrast, the indefinite article has two forms: “един” (masculine) and “една” (feminine). These forms agree in gender and number with the noun they modify. For instance, “един ден” (one day) and “една книга” (a book) demonstrate the agreement between the indefinite article and the noun.

Understanding the theory of articles is crucial for achieving accuracy and fluency in Bulgarian grammar.