应该用 someoneelse's。又如: She took someone else's book in mistake for her own. 她把别人的书错当成自己的书拿走了。《简明英汉词典》 The author lifted the paragraph from someone else's work. 这一段是作者从别人的作品中抄来的。《现代汉英综合大词典》 You're wearing somebody else's coat. 你穿的是别人的外衣。《牛津英语用法指南》 Why should I pay the penalty for somebody else's mistake? 为什么我要代人受过?《柯林斯高级英语学习词典》
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