the days are long为什么要加Sthe days are long and the nights are short.还有the sun rises early and sets late

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the days are long为什么要加S
the days are long and the nights are short.
还有the sun rises early and sets late

DAYS的谓语动词是ARE,这是复数名词的谓语形式.
THE SUN是专有名词,因为太阳只有一个,所以用单数,动词就用一般现在时

谓语是are,对应主语要用复数
后面一句the sun是单数,并且表示一般状态,用一般时态