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

题目

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

答案

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.