可数名词单数变复数: ① 一般加s :lesson → lessons, pen → pens ② 以s, x, ss, ch, sh, o结尾的加es :buses, boxes, classes, watches, brushes, hero → heroes 但有些以o结尾的名词.是加s构成复数:kilo → kilos, piano → pianos, radio → radios, photo → photos, zoo → zoos ③ 以辅音字母 + y 结尾的改y为i.再加es :city → cities, story → stories ④ 以f 或fe结尾的.一般将f或fe改为v.再加es :knife → knives, leaf → leaves 但有些以f 结尾的名词.是在f后加s.构成复数形式:belief → beliefs, roof → roofs, safe→ safes, proof→ proofs, chief → chiefs, handkerchief → handkerchiefs 【
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