Question

Though he has had ups and downs, I believed all along that he would succeed someday.语法讲解。

为什么后半句要用过去式（虚拟语气？）？英语菜鸟求解啊。。。

Answer 1

believed后面的宾语从句要与其时态一致而已，从句是所谓放之四海而皆准真理性的东东就一般现在时一种形式

Answer 2

would在这里是助动词，不是will的过去式，表示将会成功的意思

Answer 3

这是谁写的句子？有问题，要改：
Although he has experienced ups and downs, I still believe he will one day succeed