Question

语法解析和翻译，that从句的用法？

This is the payoff of patience, the joy of watching something grow that wouldn’t have been had you not spent all those years sticking with it

Answer 1

在这个句子中，“that”从句是由“watching something grow that wouldn’t have been" 组成的定语从句， 用来修饰 something grow。该从句中的"that" 是引导由 "wouldn't have been"构成的虚拟语气从句，表示如果你没有坚持下来，你就不会看到生长中的愉悦。
翻译：这就是耐心的回报，看着一个本来不会生长的东西，因为你坚持了这些年，它现在才能够生长，而这带来了无限快乐。