A paragraph revolves around a single idea. The first line of a paragraph often gives the main idea. All other details support the main idea of the passage.
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Paragraph on a Magic Show You Have Seen
Yesterday I went to a magic show. Popular magician, T. Smith and his team performed at the town hall. The hall was crowded with men, women and children. After some minor tricks, he moved on to the famous mango trick. The magician buried an old, dry mango stone in the ground and covered it with a cloth. Then he mumbled some unintelligible words and grabbed the cloth. I saw a mango seedling coming out of the ground. I was surprised because of the tricks.
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Paragraph on Self-reliance
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Paragraph on Good Manners
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Paragraph on Life in a Big City
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