口语表达中，不可不知的数词知识盘点
<p>在生活中，有关数字的表达，有时候不是1、2、3、4……就能说清的，很多情况下，我们要用到”第一“、”第二“、”第三“……，在英语中，这类数词被叫做”序数词“。常见的有以下几种情景：</p><p>1.询问日期：</p><p><span word="Q">Q</span>：<span word="What">What</span>'<span word="s">s</span> <span word="the">the</span> <span word="date">date</span> <span word="today">today</span>? 今天几号?</p><p><span word="A">A</span>：<span word="It">It</span>'<span word="s">s</span> <span word="March">March</span> (<span word="the">the</span>) <span word="sixth">sixth</span>. 今天3月6日。</p><p>2.描述名次</p><p><span word="She">She</span> <span word="was">was</span> <span word="the">the</span> <span word="third">third</span> <span word="in">in</span> <span word="the">the</span> <span word="exam">exam</span>. 她那次考试第三名。</p><p>3.描述先后次序</p><p><span word="He">He</span> <span word="came">came</span> <span word="in">in</span> <span word="first">first</span>. 他第一个进来。</p><p>除了描述日期以外，其他用到序数词的情况都明显包含了”次序“的含义，大家不假思索就知道什么情况下要用到序数词了。</p><p>怎么把基数词变成序数词?</p><p>1.从1-19，一般情况下(除特殊情况以外)只要在基数词后面加上-<span word="th">th</span>就可以了，读作-[θ]，如下所示：</p><p>特殊拼写:</p><p>1 <span word="one">one</span> → <span word="first">first</span> 2 <span word="two">two</span> → <span word="second">second</span> 3 <span word="three">three</span> → <span word="third">third</span> 5 <span word="five">five</span> → <span word="fifth">fifth</span></p><p>8 <span word="eight">eight</span> → <span word="eighth">eighth</span> 9 <span word="nine">nine</span> → <span word="ninth">ninth</span> 12 <span word="twelve">twelve</span> → <span word="twelfth">twelfth</span></p><p>规则拼写：</p><p>2.从20开始，10的整数倍：将词尾<span word="y">y</span>变成<span word="ie">ie</span>，再加-<span word="th">th</span>构成</p><p>例：30 <span word="thirty">thirty</span> → <span word="thirtieth">thirtieth</span> 50 <span word="fifty">fifty</span> → <span word="fiftieth">fiftieth</span></p><p>70 <span word="seventy">seventy</span> → <span word="seventieth">seventieth</span> 90 <span word="ninety">ninety</span> → <span word="ninetieth">ninetieth</span></p>
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