A preposition is something which you should never end a sentence with : A corpus-based study on preposition stranding

Abstract: This study examines to what extent preposition stranding is used in connection with which, whom and who in three different UK papers. Also what factors influence the use of preposition stranding has been studied. The hypothesis that pied-piping is more common than preposition stranding has been confirmed. A factor that has a certain influence on the use of preposition stranding is the style of the paper. The more formal of the papers studied, The Times, did not use preposition stranding to the same extent as the other two, The Sun and Today. The subject domain of the texts has influence on the use of preposition stranding, with more informal domains such as sports and miscellaneous (e.g. gossip) using stranding to a higher extent than the other domains, e.g. business, politics and culture. The prepositions themselves also influence the use of preposition stranding with some prepositions, such as on, with, for and into, that are likely to appear stranded and others, such as in that are likely to appear pied-piped.