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Peoples is used when we talk about two or more. What is the plural of people person? 倾听人民呼声 汇聚人民智慧 下载“人民网+”客户端 给领导留言 扫码关注公众号 “领导留言板”客服邮箱：leader@people.cn
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A people person is someone who is outgoing and has good communication skills. When we talk about a specific group of people, we consider it as singular and therefore, no need to add s. He was always energetic and positive and he was a people person.
People is a collective noun.
