初一英语词汇复习:数词小结（一）
<p> 在学完定语从句之后，同学们会接触到的另一个语法项目是数词。表示数目、多少和顺序先后的词叫数词。数词有两种：表示数目多少的数词叫基数词，如：<span word="one">one</span>，<span word="ten">ten</span> <span word="twenty">twenty</span>-<span word="three">three</span>；表示顺序先后的数词叫序数词，如：<span word="first">first</span>，<span word="third">third</span>，<span word="twentieth">twentieth</span>。</p><p> 1.基数词</p><p> 基数词相当于名词，在句中可做主语、表语、定语、状语等。如：</p><p> <span word="Three">Three</span> <span word="of">of</span> <span word="my">my</span> <span word="classmates">classmates</span> <span word="are">are</span> <span word="from">from</span> <span word="Shanghai">Shanghai</span>.</p><p> <span word="I">I</span> <span word="am">am</span> <span word="twenty">twenty</span> <span word="this">this</span> <span word="year">year</span>.</p><p> <span word="They">They</span> <span word="have">have</span> <span word="four">four</span> <span word="classes">classes</span> <span word="in">in</span> <span word="the">the</span> <span word="morning">morning</span> <span word="and">and</span> <span word="three">three</span> <span word="in">in</span> <span word="the">the</span> <span word="afternoon">afternoon</span>.</p><p> 2.序数词</p><p> 1)序数词的构成：</p><p> ★大多数的序数词是由基数词加-<span word="th">th</span>构成。如：<span word="seven">seven</span>―<span word="seventh">seventh</span>；<span word="ten">ten</span>―<span word="tenth">tenth</span></p><p> ★以-<span word="t">t</span>结尾的基数词只在词尾加-<span word="h">h</span>。如：<span word="eight">eight</span>―<span word="eighth">eighth</span></p><p> ★以-<span word="ve">ve</span>结尾的基数词改-<span word="ve">ve</span>为<span word="f">f</span>再加-<span word="th">th</span>。如：<span word="five">five</span>―<span word="fifth">fifth</span>；<span word="twelve">twelve</span>―<span word="twelfth">twelfth</span></p><p> ★以-<span word="y">y</span>结尾的基数词改-<span word="y">y</span>为-<span word="ie">ie</span>再加-<span word="th">th</span>。如：<span word="twenty">twenty</span>―<span word="twentieth">twentieth</span>，<span word="thirty">thirty</span>―<span word="thirtieth">thirtieth</span></p><p> ★几十几的序数词只在个位数体现。如：<span word="twenty">twenty</span>-<span word="one">one</span>―<span word="twenty">twenty</span>-<span word="first">first</span>；<span word="thirty">thirty</span>-<span word="three">three</span>―<span word="thirty">thirty</span>-<span word="third">third</span></p><p> ★特殊的序数词：</p><p> <span word="one">one</span>―<span word="first">first</span>；<span word="two">two</span>―<span word="second">second</span>；<span word="three">three</span>―<span word="third">third</span>； <span word="nine">nine</span>―<span word="ninth">ninth</span></p><p> 2)序数词在句中同样可做主语、表语、定语、状语等。如：</p>
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