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When your reader or listener already understands the nouns you're referring to, you can replace them with pronouns. As an illustration, you may say, "I have a dog. He is white and brown. You just mentioned your dog in the first phrase, so there's no need to explicitly state that you're describing him in the second. However, saying "brown and white" after "I have a dog" is grammatically incorrect; instead, you need the pronoun "he's" to make the phrase "brown and white" into a complete sentence. A pronoun's functions go well beyond simply converting phrases into sentences. They set the scene, clarify the meaning of your sentences, and influence how we view people and objects.
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