Question

what is future perfect continuous tense​

Answer 1

The future perfect continuous, also sometimes called the future perfect progressive, is a verb tense that describes actions that will continue up until a point in the future. The future perfect continuous consists of will + have + been + the verb's present participle (verb root + -ing).

Answer 2

the future perfect of the verb "to be" (will have been) + the present participle of the main verb (base + ing)

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