在英语里coms been、must been和may been和come have been、must have be

你说的应该是can/could be、must be、may/might have been、must have been
can/could be：表猜测,可能
must be:一定
may/might be：可能,语气比can/could弱
must have been:一定做过,表动作已发生
may/might have been:可能做过,表动作已发生