??? ?? ??, ?????? ??, ???? ???????????? ?????? ??? ???? ?????????? ????????????????, ?? ????????????The two most common grammatical rules where this occurs is when conjugating up to now or current tenses. For illustrations:?? ???? ??????, ???? ???? ???? ?? ??? ??????.?????? ???? ?? ???? ??? ?? ?? ?????? ?????? ?????? ???? ???????? ?????????? ??????