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the days are long and nights are short. the sun rises early

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the days are long and nights are short. the sun rises early and sets late .两句话里面的s为什么要加s
the days are long and nights are short. the sun rises early
day和night是指无数个日夜,复数名词要加s;而太阳只有一个,主语为第三人称单数,而且太阳升起和落下是现在时,所以谓语动词就要加s.一般动词碰到主语是第三人称单数现在时要加s或es ,具体情况根据动词而定.