The future perfect is formed with - will + have + past participle. The past participle of have is had.
The verb phrase is -- will have had.
eg They will have had their breakfast by 10:00am
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The future perfect tense of "give" is "will have given."
The future perfect tense of "know" is "will have known."
The future perfect tense of "cry" is "will have cried."
The future perfect tense of "start" is "will have started."
The future perfect tense of "lose" is "will have lost."