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Correlative particles are used as a pair to join together two different words, phrases, or clauses. The first particle is a correlative adverb. The second particle is a correlative conjunction. For example, consider the sentence, "You may choose either this book or that book." The words "either" and "or" are correlative particles. The word "either" is a correlative adverb. The word "or" is a correlative conjunction. The two correlative particles work together and as a result join together the two phrases "this book" and "that book."