数词
<p> 表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。 </p><p> 一、基数词 </p><p> 1）基数词写法和读法： 345 <span word="three">three</span> <span word="hundred">hundred</span> <span word="and">and</span> <span word="forty">forty</span>-<span word="five">five</span>； </p><p> 2）基数词一般是单数形式，但下列情况，常用复数： </p><p> <span word="a">a</span>. 与<span word="of">of</span> 短语连用，表示概数，不能与具体数目连 用，如<span word="scores">scores</span> <span word="of">of</span> <span word="people">people</span> 指许多人； <span word="http">http</span>://<span word="yingyu">yingyu</span>.<span word="chazidian">chazidian</span>.<span word="com">com</span></p><p> <span word="b">b</span>. 在一些表示"一排"或"一组"的词组里； </p><p> 如：<span word="They">They</span> <span word="arrived">arrived</span> <span word="in">in</span> <span word="twos">twos</span> <span word="and">and</span> <span word="threes">threes</span>. 他们三三两两的到达了。 </p><p> <span word="c">c</span>. 表示"几十岁"； </p><p> <span word="d">d</span>. 表示"年代"，用 <span word="in">in</span> +<span word="the">the</span> +数词复数； </p><p> <span word="e">e</span>. 在乘法运算的一种表示法里，如：3 <span word="x">x</span> 5 = 15 <span word="Three">Three</span> <span word="fives">fives</span> <span word="is">is</span> (<span word="are">are</span>) <span word="fifteen">fifteen</span>. </p><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>
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