In some cases, there are less common forms in which the auxiliary " I5 " remains impersonal instead of being inflected for person and number; thus for the inferential and renarrative future / future in the past rare forms of the type " I5 AJ < G5BO; " are possible alongside the more common forms of the type " IO; AJ < 40 G5B0 ", for the inferential future perfect in the past-" I5 AJ < 1 ] ; GP; " alongside the usual " IO; AJ < 40 AJ < GP; ", and for the dubitative future / future in the past-rare forms of the type " I5 AJ < 1 ] ; G5BO; " in addition to the more common forms of the type " IO; AJ < 1 ] ; 40 G5B0 ".