In Slovenian grammar, the theory of prepositions plays a crucial role in understanding sentence structure and meaning. Prepositions are words that indicate relationships between different elements in a sentence, such as location, time, manner, or direction. They usually come before a noun or a pronoun and show how that word relates to the rest of the sentence.

One important aspect of prepositions in Slovenian is their case government. Depending on the preposition used, the accompanying noun or pronoun will be in a specific case, such as nominative, accusative, dative, genitive, or locative. The choice of case depends on the meaning that the preposition conveys, such as movement toward, location in, or possession of.

Moreover, the theory of prepositions also encompasses the rules for combining prepositions with other parts of speech to form prepositional phrases. These phrases provide additional information about the action or the state described in the sentence. Understanding how prepositions function in Slovenian grammar is essential for constructing grammatically correct and meaningful sentences.