It is difficult for us to learn a lesson in life until we ha

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/17 06:27:33

It is difficult for us to learn a lesson in life until we have actually had that lesson.
这句话的从句中为什么要用现在完成时呢,前面用的不是一般现在时吗?

这句话大致意思是“我们难以学会教训知道我们在生活中确实得到了那个教训.”前面的is用一般现在时态,讲述的是一个一般的事实,后面用现在完成时态是强调现在的结果“已拥有了教训”.主从时态一致,不等同于时态要完全相同.
再问：那完成时不是表示从以前到现在都已经拥有了教训了吗？那既然以前的时候也有那前面就不能用is了因为以前也有现在就不难了啊

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