have been 和 had been的区别

have been 和had been 什么区别 have been to和had been to的区别 had been 和 has/have been的区别是什么? have been / has been / had been 的区别 关于Have和Had 还有Have been和Had been的区别 had been和have been有什么区别?请举例 问had been to 和have been to区别 have has had或 having +been 的区别和用法 have been 和 has been的区别 had/have/has gone/been 的区别 have/had + been/be的区别是什么? I had been sitting 和 I have been sitting 的区别