actually children go to school to prepare themselves for the time when they will grow up and have to support themselves
怎么翻译好？
还有，这里为什么用will grow up？我觉得应该是一般现在时。

so even after we have left it,we have to go on to learn
怎么翻译？这里有什么特殊用法？

actually children go to school to prepare themselves for the time when they will grow up and have to support themselves
实际上孩子上学是为了为了他们将来长大并且供养自己时做准备。
为了他们将来长大，所以应该用将来时。
so even after we have left it,we have to go on to learn
所以即使我们放下了它，还是必须继续去学习的。
没有什么特殊用法吧，就是前面是一个时间状语从句。