Instrument Prepositions in Romanian grammar are used to indicate a relationship between an object and an action – that is, how an action is being performed. They help describe situations where an object is used as a tool or means to perform an action. Some common examples of instrument prepositions in Romanian are “cu” (with), “de” (by, of), “pe” (on), and “la” (at). These prepositions are a crucial component of Romanian grammar, part and parcel of creating context and meaning in a sentence.