???? ???????? ????????? ???? ???? ?? ???The 2 commonest grammatical principles where by this happens is when conjugating previously or current tenses. For illustrations:???????? ??????? ?????????? ??????. ??????????????/?? ?????????? ??????.??(??)?? ?????? : ??, ??, ????, ??, ???? ?·???????, ?? ?????? : ?????? ?????????? ??·??????????? ???? [??]