如：The rooms had been cleaned when I came. 我來的時候，房間已經(jīng)被打掃了。have/has been done是現(xiàn)在完成時的被動語態(tài)。表示某事被做。

　　過去將來完成進行時：(would have been doing)

　　表示動作從過去某一時間開始一直延續(xù)到過去將來某一時間，期間一直有規(guī)律在進行、不曾間斷，并且有可能繼續(xù)延續(xù)下去。

　　例：They said that by the end of the following month, the project would have been being worked for 3 years.

　　他們說到第二個月底為止，這項工程就已經(jīng)不停地進行了3年了。