英文中的词形转换. 名词的复数. 1. 直接加 s, e.g.: books, trees 2. 以“ s, x, ch, sh” 结尾，加 es, e.g.: buses, boxes, benches, dishes 3. 以“ f, fe” 结尾，变成 ves, e.g.: leaves, knives 4. 以“ o” 结尾，元音字母 +o 结尾，加 s, 辅音字母 +o 结尾，加 es, e.g.: radios, potatoes 5. 以辅音字母 +y 结尾，变 y 为 i, 再加 es, e.g.: cities
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