Before long,he __will forget___ all about what happened today横线处为什么不能用will have forgetten

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Before long,he __will forget___ all about what happened today横线处为什么不能用will have forgetten
Before long,he __will forget___ all about what happened today
横线处为什么不能用will have forgetten

Before long,he __will forget___ all about what happened today横线处为什么不能用will have forgetten
表示将来某时刻前 或 某动作发生之前已完成的动作 才用将来完成时

一般过去时

will是助动词,have也是助动词,forget是动词,助动词后应加动词作谓语

没有强调前后不能用have

forget是非延续性动词