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6.3 分数
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6.3.1 分数的构成
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a 不带整数的分数
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分子用基数词，分母用序数词；分子与分母之间可用连字符连接，也可不用；当分子大于1时，分母用复数形式。
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1/3 : a third 或one third (one-third)
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2/3 : two thirds (two-thirds)
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1/4 : a fourth或one fourth(one-fourth)，但更常见的表示方式为a quarter或one quarter
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3/4 : three fourths 或 three quarters
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1/5 : a fifth 或one fifth (one-fifth)
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2/5 : two fifths (two-fifths)
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3/5 : three fifths (three-fifths)
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4/5 : four fifths (four-fifths)
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注意：1/2的表示方法只能是a half 或one half。
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当分数较为复杂时，都用基数词，中间加over。
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39/7 : thirty-nine over seven 18/19 : eighteen over nineteen
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137/465 : one hundred and thirty-seven over four hundred and sixty-five
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简单的分数也可采取这种表示方法：
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1/3 : one over three 2/3 : two over three
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b 带分数（带整数的分数）
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整数与分数之间用and连接。
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2 1/2 : two and a half
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3 1/4 : three and a quarter
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5 2/3 : five and two thirds
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6.3.2 分数的语法功能
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分数在句子最常用作主语、宾语、定语等。
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