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序数词表示数量的数词叫基数词，表示顺序的词叫序数词，除特殊情况外，序数词一般由相应的基数词加后缀“th” 构成。口诀：一,二,三变字体；th从4上起；8加h,9减e；用f代ve；ty变为tie。第1至第3分别为first,second,third,它们没有规律；第4至19通常由基数词加“th”构成。特殊:five-fifth,eight-eighth,nine-ninth,twelve-twelfth. 整十的数词，其后缀“ty” 要先变“tie”,再加“th”如：seventy-seventieth 几十几数只需把个位数变为序数词，十位数仍保留其基数词形式，如：forty-one→forty-first 基数词序数词备注基数词序数词备注 one first 简写1st six sixth 6th two second 简写2nd seven seventh 7th three third 简写3rd eight eighth 8th four fourth 4th nine ninth 9th five fifth 5th ten tenth 10th twelve twelfth 12th twenty twentieth 20th thirty thirtieth 30th forty fortieth 40th fifty fiftieth 50th sixty sixtieth 60th seventy seventieth 70th eighty eightieth 80th ninety ninetieth 90th hundred one hundredth 100th twenty-one twenty-first 21st twenty-two twenty-second 22nd twenty-thre twenty-third 23rd twenty-four twenty-fourth 24th 基变序口诀：一、二、三，单独记；八去t，九除e，要用替，整十基数变序数，先把ty变成tie；要是遇到两位数，十位基数个位序，th最后加上去。

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