???????? ???? ? ??? ?? ?? ????????If a grammatical principle which is included to ????can be a vowel ??and there is no other option in addition to a vowel ??then that grammatical theory can't be extra to ???? ?????? ????????, ?? ??????, ?? ??, ?????? ?? ??????????????.?? ?? ???? ?? ???????????????? ?????? ?????? Q&A ?????? ?????????(??)???????? ??