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'.

When you park at a sign in Fells Point that says “2 Hour Parking Limit in Area #16,” please pay careful attention to the preposition (which I italicize for those of you who, like me, didn’t pay much ...