题目内容
14．Jerry's father has just had hisfortieth（ forty ） birthday．分析 Jerry的父亲刚刚过了他的四十岁生日．
解答 答案：fortieth．本题是表示四十岁生日，应该用序数词形式，作birthday的定语，前面有形容词性物主代词his修饰，所以省去定冠词the；forty是基数词，四十；变为序数词，第四十，把y改为ie，后面再加th，故填fortieth．
点评 本题是考查数词的用法，解决此类问题的关键是分清基数词和序数词，在不同的语言环境中达到熟练掌握的目的．
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