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For National Grammar Day on March 4, Grammar Girl explores the Top Ten Grammar Myths. Here's number one:

1. You shouldn't end a sentence with a preposition.

Wrong! You shouldn't end a sentence with a preposition when the sentence would mean the same thing if you left off the preposition. That means "Where are you at?" is wrong because "Where are you?" means the same thing. But there are many sentences where the final preposition is part of a phrasal verb or is necessary to keep from making stuffy, stilted sentences: I'm going to throw up, let's kiss and make up, and what are you waiting for are just a few examples (go here for details). Find more information about these myths in the Grammar Girl archives at http://quickanddirtytips.com/