" I’ve read long, contorted arguments from noted grammarians about why it’s OK to end sentences with prepositions when the prepositions aren’t extraneous, but the driving point still seems to be that nobody in their right mind talks this way. Yes, you could say, “On what did you step?” but not even grammarians think you should. "

― Mignon Fogarty , Grammar Girl's Quick and Dirty Tips for Better Writing