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An action that will be completed before a future point.
Why you specifically

The rule
The future perfect is formed with will have + past participle. It is used when one future action will already be completed before another future time or event.
The trap

By 6 p.m., she will finish her homework.
By 6 p.m., she will have finished her homework.
The future perfect is used for an action completed before a specific future time.
They will leave before the meeting starts.
They will have left before the meeting starts.
Use will have + past participle to show that the leaving is completed before another future event.
By next year, I work here for ten years.
By next year, I will have worked here for ten years.
The future perfect can describe something that will be true by a future time because the action or state will already be completed or reached that point.
By the time you arrive, we eat dinner.
By the time you arrive, we will have eaten dinner.
The action is completed before the later future event.
Prove it
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