Prepositions show the relationship between words. A preposition is a word that relates a noun or pronoun to another word. Common prepositions include aboard, above, across, after, against, along, among, around, at, before, behind, below, beneath, beside, between, beyond, by, concerning, down, during, except, for, from, in, inside, into, like, near, of, off, on, out, outside, over, past, since, through, throughout, to, toward, under, underneath, until, up, upon, with, within, without. A prepositional phrase begins with a preposition and ends with a noun or pronoun as its object, and can