?????? ?? ?? ?? ???? ???????????? ??????????The 2 most typical grammatical concepts in which this occurs is when conjugating up to now or existing tenses. For illustrations:???? ??????? ???????? ???????. ??? ??????????????? ???????? ????, ???????? ?????? ????????? ???????????? ???? ????. ???? ???????? ?? ?????? ??? ??????. ?????? ???? ?????????, ??