had been和have been有什么区别?请举例
问题描述：
had been和have been有什么区别?请举例
答
had been是过去完成时结构：had+动词过去分词：表示两个事件中一个发生在前,或者说是表示较早的过去.
After they had entered the house,they went into the dining room.
他们进到屋里后,走进了饭厅.
have been是现在完成时结构：have/has+动词过去分词：单数第三人称用has,其余用have.表示在过去不确定的时间里发生的并与现在有着某种联系的动作；或者表示开始于过去并持续到现在的动作.
I've just had a cup.我刚喝了一杯.此处had为动词have（喝）的过去分词