have been與had been的區別？（謝瓜了）

have been是現在完成時，表示做過這件事已經完成。

比如說i have been to shanghai.

意思是我已經去過上海了。

had been是過去完成時,即過去完成過什麽動作,做過這件事。

I had been a good student.

我過去曾經是壹個好學生。