befor long shortly after如何区别?

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before long：一个固定短语,常用作时间状语.常用于将来时态.
如：He will e back before long.
Shortly after=soon after: after后常接名词或从句.
如：Shortly after he came, we began our work.
By then, some plants will be flowering shortly after Christmas.
到那时,某些植物将在圣诞节后不久就开花.
======以下答案可供参考======
供参考答案1:
意思都不一样啊