Have been 和 Be 的分别

Have been 和 Be 的分别 请问May be 和May have been 的区别,它们分别在什么时候用? will have been pulled 和will be pulled的区别 have been done与be done的区别和用法 真纠结的英语词组的区别!be in 和 be ; have been in 和 have been;the last w be said to be doing和be said to have been doing的区别 be supposed to be done 和be supposed to have been done的区别 have already been重复吗?have been的意思不就是 已经被...他和have already be have been done 和 to be done there be 和 there has/have been might be和 may have been的区别?还有是might do和 may have done have been 和 has been的区别