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1、直接在末尾加S的：brothers,parents, sisters,friends, books , keys.be动词is 复数：are.物主代词的this的复数：these.there are brothers parents sisters friends books keys 直接在末尾加S的：brothers,parents, sisters,friends, books , keys. be动词is 复数：are. 物主代词的this的复数：these.these,are,brothers,parents,sisiers,friends,books,keysthesearebrothersparentssistersfriendsbookskeysthese are brothers parents sisiters friends books keys。
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