Dryden famously invented the myth that sentence-ending prepositions are an error.... Nearly three and a half centuries later there are still American writers and academics who think stranding a preposition is something to feel guilty about. Other admonishments: Avoid starting sentences with "that." Use "who" for people and "that" for things. "[A]void the words, don’t, can’t, shan’t, and the like abbreviations of syllables; which seem to ... savour of a little rusticity."