英语语法大全第一部分 词法（数词）
<p> 英语语法大全第一部分 词法</p><p> 数词</p><p> 一.概念:</p><p> 数词分两类:基数词和序数词.表示数目的词叫基数词,表示须序的词叫序数词.</p><p> 二.相关知识点精讲</p><p> 1.基数词</p><p> 1）基数词一般可写成如345或<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，但遇下列情况，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；</p><p> <span word="b">b</span>. 在一些表示一排或一组的词组里。例如：</p><p> <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<span word="Three">Three</span> <span word="fives">fives</span> <span word="isfifteen">isfifteen</span>。</p><p> 2.序数词</p><p> 序数词的缩写形式如<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>等。</p><p> 3.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+ <span word="as">as</span> + <span word="adj">adj</span>. + <span word="as">as</span>。例如</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+ <span word="the">the</span> <span word="size">size</span> <span word="of">of</span>。例如：</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>
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