1) big a) bigger b) more big 2) cheap a) cheaper b) cheapper 3) comfortable a) comfortabler b) more comfortable 4) difficult a) more difficult b) difficulter 5) dirty a) dirtyer b) dirtier 6) good a) more good b) better 7) expensive a) expensiver b) more expensive 8) hot a) hoter b) hotter 9) quiet a) quieter b) quietter 10) tall a) taller b) more tall 11) pretty a) more pretty b) prettier 12) warm a) warmer b) warmmer 13) old a) more old b) older 14) early a) earlyer b) earlier 15) sad a) sader b) sadder

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