Prepositions are used to connect a noun or pronoun to another word or phrase in a sentence.As in english, pronouns in norwegian that are the objects of prepositions must be in the object case:
Jeg vil bli med henne-Iwant to be with her
Prepositions frequently have spatial meanings as their primary sense."On" sugests a position above and supported by another object. In addition to these spatial meanings ,their meanings, the meanings of a preposition may be extended to deal with the time or manner of an action.