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专题三：数词与主谓一致 专题讲解 一、基数词与序数词 数字 基数词 序数词 缩写 易错点 1 one first 1st 不规则变化 2 two second 2nd 不规则变化 3 three third 3rd 不规则变化 4 four fourth 4th 去u加th 5 five fifth 5th ve变f加th 8 eight eighth 8th 去t加h 9 nine ninth 9th 去e加th 12 twelve twelfth 12th ve变f加th 20 twenty twentieth 20th y变ie加th 21 twenty-one twenty-first...