the reeds and brass have been weaving 编制芦苇和黄铜?还有为什么要用have be

the reeds and brass have been weaving 编制芦苇和黄铜?还有为什么要用have be have been doing 为什么还有 have been dead might be和 may have been的区别?还有是might do和 may have done 真纠结的英语词组的区别!be in 和 be ; have been in 和 have been;the last w have you just been to the cinema?你刚刚去过电影院吗?这里的be为什么成了been.还有 英语：这里为什么要用have been I have been sick since yesterday.中have been 是什么是时态为什么要用been. Have been 和 Be 的分别 have been done 和 to be done there be 和 there has/have been have been=be have/had + been/be?