关于MAY HAVE BEEN的用法当它表过去时,为什么不用变成MIGHT HAVE BEEN

关于MAY HAVE BEEN的用法当它表过去时,为什么不用变成MIGHT HAVE BEEN have been 的用法? have been studying过去进行?用法?have been studying是过去进行吗它意思是什么?过去进行的用法? have been+adj的用法 have ever been 的用法? have been on的用法 have been to和have gone to 的区别和用法!关于”语法”方面”意思”方面”用法”方面等 英语have been studying过去进行?用法?have been studying是过去进行吗它意思是什么?过去进行的用法? there has/have been的用法 have been的意思及用法. 关于英语语法中的现在完成时..谢.有没有“don't have been to”的用法啊?有没有“don't have been to”的用法啊?. may have been 和may have done的区别,特别是may have been doing和may have done的区别,他们都表对过去推测啊? 英语比较厉害的 关于 have been 的用法的~have been do sth.have been doing sth.有什么区别?比如：I skated for 4 hours.和 I have been skated for 4 hours.有什么区别? may have been怎么用 have been in have been to have gone to用法have been in和 have been to和 have gone to的用法 might be和 may have been的区别?还有是might do和 may have done been in have been to have been on的意思以及用法 英语HAVE BEEN TO 和HAVE GONE TO 的用法