Life is not easy,so I'd like to say " When anything ______ (happen) ,believe in youself!"

问题描述:

Life is not easy,so I'd like to say " When anything ______ (happen) ,believe in youself!"
答案是happens ,为什么呢?
这和"What's happened?" 又有什么区别呢?
(即什么时候用happens,什么时候用happened呢?)

What's happened 这句话是现在完成时
因为那句话为一句谚语 所以此时happen应为一般现在时 又因为anything后的动词要用单三 所以用happens
区别在于时态