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1.以o結尾的表示“有生命”的事物加es如:tomato、potato、mangoes、hero後加-es 2.以o結尾的表示“無生命”的事物加s如:radio、piano、photo後加-s 3.有些名詞像volcano(火山)、tobacco(烟草)等,其複數形式加-s或-es均可.
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