future perfect noun
[noncount] grammar : a verb tense that is used to refer to an action that will be completed by a specified time in the future
▪ The future perfect in English is formed with “will have” and “shall have,” as in “They will have left by the time we arrive.”
▪ The future perfect in English is formed with “will have” and “shall have,” as in “They will have left by the time we arrive.”
