As far as I know these are tenses that you do not often use. Am I right?
Will have been + verb+ing
Would have been + verb+ing
Learn English – Are “I will have been going” and “I would have been going” rarely used today
futuregrammarusage
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Best Answer
You are right that the two constructions are not often used. This is because they express uncommon ideas. Both are grammatical, however, and could be used as follows: