A preposition is a word that tells you where or when something is in relation to something else. Examples of prepositions include words like 'after', 'before', 'on', 'under', 'inside' and 'outside'.

PPs may be adjoined to both NP and VP or they may function as a complement to either category. Given a phrase with a PP, it is not easy to determine the PP is a complement or a modifier. A couple of ...