the sun sets为什么加s
问题描述：
the sun sets为什么加s
答
因为sun的单数,在一般现在时中,
主语是单数的,谓语V要加s或es,系动词就用am/is；
第二人称和复数,谓语V或系动词就是原型了.
例： She gets up at 7:00 everyday. 这里get就加s
Mosun is a girl.
They are boys.
You are great.
We are friends.