作业帮a set of keys 为什么key加‘s’还有play computer games 也加‘s'
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a set of keys 为什么key加‘s’还有play computer games 也加‘s'
a set of keys 为什么key加‘s’还有play computer games 也加‘s'
a set of keys 为什么key加‘s’还有play computer games 也加‘s'
①a set of指的是“一串、一副”,是个复数的概念,所以key后面要加s.
②game是一个可数名词,可数名词的单数是不能单独使用的,所以只能说“play computer games”或者“play a computer game”,表示“玩电脑游戏”这个广义的概念的时候就最好用“play computer games”了.
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