??(??)?? ????????????, ???????????? ???? '?? ????'???? ??, ?? ?????????? ???????????????? ?????? ???? ????????.  The 2 most commonly encountered grammatical rules where this occurs is when conjugating in past times or existing tenses. For illustrations:????? ???? ?? '??????' ?????????? ?? ???????? ???? ?? ?????? ???????? ?? = ????&??????®???? ??