Prepositions: Locators in Time and Place
http://grammar.ccc.commnet.edu/grammar/prepositions.htm
You may have learned that ending a sentence with a preposition is a serious breach of grammatical etiquette. It doesn't take a grammarian to spot a sentence-ending preposition, so this is an easy rule to get caught up on (!). Although it is often easy to remedy the offending preposition, sometimes it isn't, and repair efforts sometimes result in a clumsy sentence.
DA: 28 PA: 5 MOZ Rank: 29 Up or Down: Up