Future Perfect tense


I cannot understand the usage of this tense. For example, what does "I will have done this task" mean? Does it mean the effects of this task will be remaining in the future?


On a more general note, please tell me in which situations I can use this tense.



Answer




I will have done this task when you arrive



means I am expressing my certainty that by the time you come, the task will be completed. This construction is used to show that something will be finished when something else happens in the future.


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