?????? ???? ???????????? ?????? ????????????.The two most popular grammatical principles the place this occurs is when conjugating in past times or existing tenses. For examples:- ?????????? ??????????, ????????, ??????, ??????????? ???????????????? ??·?????????? ???? ?????????????? ??????????????? ???? ?? ????? ???????????? ??????????? ??????

- ??? ????(????? ??)???? ?? ????????? ?? ???? ??.If a grammatical basic principle that's added to ????is actually a vowel ??and there is no other possibility apart from a vowel ??then that grammatical principle cannot be extra to ???????????? ?????????????? ?????? ???? ???????? ???????????? ?????? ????()?? ?? ????      ????.??????????????????