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English definition of “future perfect”

future perfect

noun [U]  /ˈfju·tʃər pɜr·fIkt/ us  
grammar the tense formed using "will have" or "shall have" with a past participle to show that an action will be completed by a particular time in the future: "I will have left by noon" is in the future perfect.
(Definition of future perfect from the Cambridge Academic Content Dictionary © Cambridge University Press)
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