Abstract: The aim of this study is to analyze the behaviour of the preposition ”a” in the Romanian language. Having a reduced phonetic body, it is one of the most frequently used prepositions; we will emphasize the fact that the analyzed preposition can be: lexical (situation in which it imposes a thematic role, case and articulation restrictions on the dominated term), functional (in case of marking the idea of genitive or dative), without a meaning – when it accompanies the prepositions used as genitive for the certain syntactical situations. It is used as morpheme for the infinitive (mark of this non-finite form), situations in which it has a low functionality.
In this study we aim at examining the behaviour of the preposition “la” (“at/to”) in the Romanian language. The starting point of our analysis is represented by the distinctions made by the modern grammar between lexical/semi-lexical/functional prepositions. “La” (“at/to”) has, in Romanian, homonym forms which illustrate all these subcategories. We will highlight the differences in grammatical functionality between the used contexts; our study is discussing the capacity of this preposition to become a group centre, the assigning of a thematic role, the grammatical restrictions imposed on the dominated term.