看到有人这样讲“in a few days= in a few days’ time =a few days later 几天后”

问题描述:

看到有人这样讲“in a few days= in a few days’ time =a few days later 几天后”
a few days later可用于过去时,可是 能用于将来时吗?
a few days later在新标准教材上遇到了一般现在时的用法,怎么理解呢?

a few days later一般用于过去时.完整句子是什么样的?最好有上下文语境,看看用的到底合理不合理