have done,have been done,have been to do我看网上说,第一个是主动语态,第二个是被动语态,i have been to american,been 在这里是动词吗?所以是第一种have done?但是没有be to be to 没有去过某地的意思啊?

must have been done must have done have been done 语法呢 have been done 和 to be done could have been done ,could have has been doing have been done区别 have done 与have been done的区别 have done和have been done 的区别, have been done 是什么时态?那have done呢? should have done与should have been done的区别? since前用have done 还是have been done have done和have been done的用法是什么? have done和have been done有什么分别 have done与have been done的区别, being done,have been done和having done怎么分辨 HAVING BEEN DONE和HAVE BEEN DONE有什么区别? have been done和have been do的区别 have been doing ,have done和have doing区别 have been done , have been doing ,have done的区别是什么如题