数词（二）
<p> 二、序数词</p><p> 序数词的缩写形式： <span word="first">first</span>1<span word="st">st</span> <span word="second">second</span>2<span word="nd">nd</span> <span word="thirty">thirty</span>-<span word="first">first</span>31<span word="st">st</span></p><p> 三、 数词的用法</p><p> 1）倍数表示法</p><p> <span word="a">a</span>. 主语+谓语+倍数（或分数）+ <span word="as">as</span> + <span word="adj">adj</span>. + <span word="as">as</span></p><p> <span word="I">I</span> <span word="have">have</span> <span word="three">three</span> <span word="times">times</span> <span word="as">as</span> <span word="many">many</span> <span word="as">as</span> <span word="you">you</span>. 我有你三倍那么多。</p><p> <span word="b">b</span>. 主语+谓语+倍数（分数）+ <span word="the">the</span> <span word="size">size</span> （<span word="amount">amount</span>，<span word="length">length</span>） <span word="of">of</span></p><p> <span word="The">The</span> <span word="earth">earth</span> <span word="is">is</span> 49 <span word="times">times</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> <span word="the">the</span> <span word="moon">moon</span>. 地球是月球的49倍。</p><p> <span word="c">c</span>. 主语+谓语+倍数（分数）+ 形容词（副词）比较级+ <span word="than">than</span></p><p> <span word="The">The</span> <span word="grain">grain</span> <span word="output">output</span> <span word="is">is</span> 8 <span word="percent">percent</span> <span word="higher">higher</span> <span word="this">this</span> <span word="year">year</span> <span word="than">than</span> <span word="that">that</span> <span word="of">of</span> <span word="last">last</span> <span word="year">year</span>.</p><p> 今年比去年粮食产量增加8%.</p><p> <span word="d">d</span>. 还可以用<span word="by">by</span>+倍数，表示增加多少倍</p><p> <span word="The">The</span> <span word="production">production</span> <span word="of">of</span> <span word="grain">grain</span> <span word="has">has</span> <span word="been">been</span> <span word="increased">increased</span> <span word="by">by</span> <span word="four">four</span> <span word="times">times</span> <span word="this">this</span> <span word="year">year</span>.</p><p> 今年粮食产量增加了4倍。</p><p> 2）分数表示法</p><p> 构成：基数词代表分子，序数词代表分母。分子大于1时，分子的序数词用单数，分母序数词用复数：</p><p> 1/3 <span word="one">one</span>-<span word="third">third</span> ； 3/37 <span word="three">three</span> <span word="and">and</span> <span word="three">three</span>-<span word="sevenths">sevenths</span>.</p><p> </p>
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