从零开始学语法：英语分数的表示法
<p> 英语分数的表示法</p><p> 1. 用基数词+序数词表示：</p><p> 分数在英语中通常是借助于基数词和序数词来共同表达的。其中基数词表示分子，序数词表示分母。如：</p><p> <span word="The">The</span> <span word="centimeter">centimeter</span> <span word="is">is</span> <span word="one">one</span>-<span word="tenth">tenth</span> <span word="of">of</span> <span word="the">the</span> <span word="decimeter">decimeter</span> <span word="or">or</span> <span word="one">one</span>-<span word="hundredth">hundredth</span> <span word="of">of</span> <span word="the">the</span> <span word="meter">meter</span>. 厘米是分米的十分之一，或者说是米的百分之一。</p><p> <span word="However">However</span>, <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="the">the</span> <span word="boys">boys</span> <span word="will">will</span> <span word="be">be</span> <span word="less">less</span> <span word="than">than</span> <span word="a">a</span> <span word="third">third</span> <span word="of">of</span> <span word="the">the</span> <span word="girls">girls</span> <span word="in">in</span> <span word="the">the</span> <span word="class">class</span>. 但是班里男生的人数将比女生的三分之一更少。</p><p> *从以上例子可以看出：分子为1时，既可以用 <span word="one">one</span>，也可用<span word="a">a</span>。</p><p> 2. 如果分子大于1，分母则要用复数形式。如：</p><p> 三分之一 <span word="one">one</span>-<span word="third">third</span>;三分之二 <span word="two">two</span>-<span word="thirds">thirds</span></p><p> 3. 二分之一不能说 <span word="a">a</span>(<span word="one">one</span>) <span word="second">second</span>，而要说 <span word="a">a</span>(<span word="one">one</span>) <span word="half">half</span>。</p><p> 四分之一和四分之三可以说 <span word="a">a</span>(<span word="one">one</span>) <span word="fourth">fourth</span> 和 <span word="three">three</span>-<span word="fourths">fourths</span>，但常用 <span word="a">a</span> <span word="quarter">quarter</span> 和 <span word="three">three</span> <span word="quarters">quarters</span> 表示。</p><p> 4. 分数修饰的名词在句子中作主语时，谓语动词是用单数还是复数取决于名词，即与名词保持一致。如：</p><p> <span word="Only">Only</span> <span word="one">one</span>-<span word="fifth">fifth</span> <span word="of">of</span> <span word="air">air</span> <span word="consists">consists</span> <span word="of">of</span> <span word="oxygen">oxygen</span>. 氧气只占空气的五分之一。</p><p> <span word="About">About</span> <span word="two">two</span> <span word="thirds">thirds</span> <span word="of">of</span> <span word="the">the</span> <span word="students">students</span> <span word="are">are</span> <span word="going">going</span> <span word="to">to</span> <span word="attend">attend</span> <span word="the">the</span> <span word="meeting">meeting</span>. 大约三分之二的学生都将参加会议。</p>
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