Question

have been和has been的区别在哪里？

Answer 1

have been是现在完成时，表示做过这件事已经完成。

比如说i have been to shanghai.

意思是我已经去过上海了。

had been是过去完成时,即过去完成过什么动作,做过这件事。

I had been a good student.

我过去曾经是一个好学生。