have been=be

have been=be have/had + been/be? Have been Be will,will be,had been,have been have been done；have been doing;have been n(如friends);have be would have been would be 的区别 must have been done/must be done to be killed&to have been killed 有没有be have been的说法? Have been 和 Be 的分别 have been done 和 to be done there be 和 there has/have been