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During next fall and winter, we will have been learning many interesting facts about American history.
By next December, the students will have been studying American history for four months! They will have read the constitution of the United States, and they will have learned about colonial America.    

The future perfect tense contains:

the future modals shall / will
the basic from of the auxiliary verb, HAVE
the main verb in the perfect-passive participle form

John will have studied math for five years.

The future perfect continuous tense expresses something that is still continuing.  It is sometimes combined with the future perfect tense.

the future modals shall / will
the basic from of the auxiliary verb, HAVE
the perfect-passive participle of BE, been
the main verb in the continuous participle form, -ing

John will have been studying math for five years.