题目内容
10．Next Sunday is my grandpa'sninetieth （ninety） birthday．分析 下周日是我爷爷的九十岁生日．
解答 答案：ninetieth．
这里是说我爷爷的九十岁的生日，也就是我爷爷的第九十个生日，用序数词，ninety是基数词，序数词是将y变成ie加th，故答案是ninetieth．
点评 这里是考查序数词的特殊用法，同时要掌握基数词转化成序数词的规则．
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