从零开始学语法：序数词的表达法
<p> <span word="first">first</span> 1<span word="st">st</span> 第一</p><p> <span word="second">second</span> 2<span word="nd">nd</span> 第二</p><p> <span word="third">third</span> 3<span word="rd">rd</span> 第三</p><p> <span word="fourth">fourth</span> 4<span word="th">th</span> 第四</p><p> <span word="fifth">fifth</span> 5<span word="th">th</span> 第五</p><p> <span word="sixth">sixth</span> 6<span word="th">th</span> 第六</p><p> <span word="seventh">seventh</span> 7<span word="th">th</span> 第七</p><p> <span word="eighth">eighth</span> 8<span word="th">th</span> 第八</p><p> <span word="ninth">ninth</span> 9<span word="th">th</span> 第九</p><p> <span word="tenth">tenth</span> 10<span word="th">th</span> 第十</p><p> <span word="eleventh">eleventh</span> 11<span word="th">th</span> 第十一</p><p> <span word="twelfth">twelfth</span> 12<span word="th">th</span> 第十二</p><p> <span word="thirteenth">thirteenth</span> 13<span word="th">th</span> 第十三</p><p> <span word="twentieth">twentieth</span> 20<span word="th">th</span> 第二十</p><p> <span word="thirtieth">thirtieth</span> 30<span word="th">th</span> 第三十</p><p> <span word="fortieth">fortieth</span> 40<span word="th">th</span> 第四十</p><p> <span word="fifty">fifty</span>-<span word="first">first</span> 51<span word="st">st</span> 第五十一</p><p> <span word="sixty">sixty</span>-<span word="second">second</span> 62<span word="nd">nd</span> 第六十二</p><p> <span word="seventy">seventy</span>-<span word="third">third</span> 73<span word="rd">rd</span> 第七十三</p><p> <span word="eighty">eighty</span>-<span word="forth">forth</span> 84<span word="th">th</span> 第八十四</p><p> <span word="ninety">ninety</span>-<span word="fifth">fifth</span> 95<span word="th">th</span> 第九十五</p><p> 1. 英语序数词1-19中，第一，第二，第三是特殊形式，其余都是在基数词的后面加上-<span word="th">th</span>。</p><p> 2. 有几个序数词加-<span word="th">th</span>时的拼法不规则，它们是：<span word="fifth">fifth</span>, <span word="eighth">eighth</span>, <span word="ninth">ninth</span>, <span word="twelfth">twelfth</span>。</p><p> 3. 十位数整数的序数词的构成方法是：将整数基数词的词尾-<span word="ty">ty</span>中的<span word="y">y</span>改写成<span word="i">i</span>，然后加-<span word="eth">eth</span>。</p><p> 4. 基数词几十几改成序数词的时候，只要把个位数改成序数词，十位数不变。如 <span word="twenty">twenty</span>-<span word="one">one</span> 变成 <span word="twenty">twenty</span>-<span word="first">first</span>。</p>
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