???????? ???? ? ??? ?? ?? ????????The two commonest grammatical principles where by this happens is when conjugating in the past or existing tenses. For examples:???? ????? ???? ???? ???????? ?????????????????????? ???????? ????, ???????? ?????? ????????? ???????????? ???? ????. ???? = If North Korea wishes to improve their economy, the government

 ?? ?????? ??? ???????????? ?????? ??????? ???????? ?????????? ??? ????.????????? (??????) ?????? ?????????????????????? ??????????? ?????????? ??????If a grammatical theory that may be added to ????is really a vowel ??and there's no other solution in addition to a vowel ??then that grammatical basic principle cannot be added to ????- ?? ?????????