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 Future-Perfect Progressive Tense Verbs

Future-perfect progressive verbs express continuing actions that will be completed in the future.

          The future perfect-progressive tense is created with the auxiliary verbs

          will have been plus a present participle (verb with an ing ending).  

                     I will have been studying for seven straight hours when I go to class to

                           take the test.

                  Scientists will have been researching the disease for an unknown number

                           of years when they finallydiscover a cure.