the future perfect Meaning in the Cambridge English Dictionary
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Meaning of “the future perfect” in the English Dictionary

"the future perfect" in British English

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the future perfectnoun [S]

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the ​form of the ​verb that is used to show that an ​action will have been ​performed by a ​particulartime. In ​English it is ​formed by "will have" or "shall have" and a past ​participle: In the ​sentence "By that ​time I will have ​finished" the ​verb phrase "will have ​finished" is in the ​futureperfect.
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(Definition of the future perfect from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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