never fail to 和never fails to的区别在哪里 能给个句子做例子吗?

问题描述:

never fail to 和never fails to的区别在哪里 能给个句子做例子吗?

主语为第三人称单数时谓语用单数never fails to do sth其它人称用复数never fail to do 如
They never fail to pass the exams.
He never fails to pass the exams.