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Just for fun:

The doctrine that a preposition may not be used to end a sentence was first promulgated by Dryden, probably on the basis of a specious analogy to Latin, and was subsequently refined by 18th-century grammarians. The rule has since become one of the most venerated maxims of schoolroom grammatical lore. But sentences ending with prepositions can be found in the works of most of the great writers since the Renaissance. In fact, English syntax allows and sometimes requires final placement of the preposition. Such placement is the only possible one in sentences such as We have much to be thankful for or That depends on what you believe in. Efforts to rewrite such sentences to place the preposition elsewhere will have comically stilted results; for example: We have much for which to be thankful or That depends on that in which you believe. Even sticklers for the traditional rule can have no grounds for criticizing sentences such as I don't know where she will end up or It's the most curious book I've ever run across. In these examples, up and across are used as adverbs, not prepositions, as demonstrated by the ungrammaticality of sentences such as I don't know up where she will end and It's the most curious book across which I have ever run.

As the famous quote attributed to Winston Churchill goes, which he supposedly noted after an assistant had changed a sentence Churchill had ended with a preposition: ''This is the type of arrant pedantry up with which I shall not put.''