- ??? ????(????? ??)???? ?? ????????? ?? ???? ??.The two most typical grammatical principles exactly where this happens is when conjugating prior to now or current tenses. For illustrations:?? ?????? ?? ?????? ???? ????. ??, ?? ?? ??? ?? ?????????? ?? ?? ??????(??)?? ?????? : ??, ??, ????, ??, ???? ?·???????, ?? ?????? : ?????? ?????????? ??·????