has been和had been 有什么区别?

has been和had been 有什么区别? 请问have\has\had done和have\has\had been done 各有什么区别?been和gone又 there has been a time和there had been a time有什么区别? has been waited 和has been waiting 有什么区别? has been open和has been opening有什么区别 had been和have been有什么区别?请举例 have been 和had been 什么区别 请问have been 和has been有什么区别 英语语法的一些问题has been explained 和 had been explained 它们两个有什么区别吗? 初中英语语法has been和had been的区别 had been 和 has/have been的区别是什么? had gone和had been 有什么区别?