These are the 1000 most commonly used words in English, ranked in frequency order. The first 25 make up about a third of all printed material. The first 100 make up about half of all written material, and the first 300 make up about 65 percent of all written material. All students must learn to recognize these words instantly and to spell them correctly.
Source: The Reading Teacher’s Book of Lists, Fourth Edition, © 2000 by Prentice Hall Authors: Fry, Kress & Fountoukidis

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1000 Most Frequently used words in English