???? & ?????? ???????? ???????? ???? ?? ??? ?? ???? ?? ????????The 2 most commonly encountered grammatical rules in which this happens is when conjugating prior to now or present tenses. For illustrations:- ???? ??: ??, ??, ??(??, ???????? ??), ??????, ??, ???????????(??)??: ???????? ???????????? ??·???????(???????? ???????????, ??????, ????????