初中英语数词的构成及用法
<p>&<span word="nbsp">nbsp</span>;</p><p> 【小编寄语】今天英语网小编教给同学们的是初中英语数词的构成及用法，一起来学习下吧!祝同学们学习进步!</p><p> 1.序数词的构成及其说明</p><p> 1) 序数词第一、第二和第三为<span word="first">first</span>,<span word="second">second</span>和<span word="third">third</span>,其他序数词的构成是在基数词后加<span word="th">th</span>。例如：</p><p> <span word="six">six</span>&<span word="rarr">rarr</span>;<span word="sixth">sixth</span> <span word="seven">seven</span>&<span word="rarr">rarr</span>;<span word="seventh">seventh</span><span word="ten">ten</span>&<span word="rarr">rarr</span>;<span word="tenth">tenth</span> <span word="four">four</span>&<span word="rarr">rarr</span>;<span word="fourth">fourth</span></p><p> 2) <span word="fifth">fifth</span>(第五)、 <span word="eigth">eigth</span> (第八)、 <span word="ninth">ninth</span> (第九)和<span word="twelfth">twelfth</span> (第十二)在拼法上有变化。</p><p> 3) 二十、三十等基数词变为序数词时,要把<span word="y">y</span>变成<span word="ie">ie</span>再加-<span word="th">th</span>。例如：</p><p> <span word="twenty">twenty</span>&<span word="rarr">rarr</span>;<span word="twentieth">twentieth</span><span word="forty">forty</span>&<span word="rarr">rarr</span>;<span word="fortieth">fortieth</span></p><p> 4) 基数词几十几变成序数词时,表示几十的数词不变,只把表示几的基数词变成序数词。例如：</p><p> <span word="twenty">twenty</span>-<span word="one">one</span>&<span word="rarr">rarr</span>;<span word="twenty">twenty</span>-<span word="first">first</span> <span word="forty">forty</span>-<span word="five">five</span>&<span word="rarr">rarr</span>;<span word="forty">forty</span>-<span word="fifth">fifth</span></p><p> 5) 第一百、第一千、第一百万、第十亿都是在基数词后直接加<span word="th">th</span>构成。例如：</p><p> 第一百&<span word="rarr">rarr</span>;<span word="hundredth">hundredth</span> 第一千&<span word="rarr">rarr</span>;<span word="thousandth">thousandth</span>第一百万&<span word="rarr">rarr</span>;<span word="millionth">millionth</span> 第十亿&<span word="rarr">rarr</span>;<span word="billionth">billionth</span></p><p> 6).序数词的缩略形式是由阿拉伯数字加序数词的最后两个字母构成。例如：</p><p> 1<span word="st">st</span>,2<span word="nd">nd</span>,3<span word="rd">rd</span>,4<span word="th">th</span>,21<span word="st">st</span>,32<span word="nd">nd</span>,40<span word="th">th</span></p>
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