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Future perfect continuous structure

Answer» Future Perfect Continuous Tense:- The work started in past and will be still continue in future. Subject + will/shall + have + been + v1 + ing + since/for + object. ------- ( positive sentence)Subject + will/ shall + not + have + been + v1 + ing + since/ for + object. ------- ( negative sentence)Ex.= By 6 O\'clock , I will have been sitting here for 10 hours.
Subject + will/shall + have + been + V1+ing + object + for/sinceExample - He will have been singing a song for 10 minutes


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