subject and object    are joined in time.   progress to past progressive.   this is the future perfect!      we've got to start this over!      it signifies a line we parsed in future perfect.   and there's time to rectify this time.   (we're coming home!)   past progressions of the past progressive,   have me past suggestion,   and i'm parsed and poised for it this time.   (we're coming home!)   and in the present tense, the past resolves itself.   and in the present tense, the past resolves itself.   this time we're coming home!      this is the future perfect.