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到過去將來某一時間，期間一直有規律在進行、不曾間斷，并且有可能繼續延續下去。

　　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，這項工程就已經不停地進行了3年了。

　　將來完成時(will have done)

　�、俦硎疽粋�動作到將來某個時間為止已經完成，強調對將來那個時間產生的影響。

　　例：Pick me up at 8 o'clock,I will have had breakfast by then.

　　早上8點鐘你來接我,到時我已經吃完早飯了.

　�、诒硎疽粋�動作延續到將來某個時間，并且有可能繼續延續下去。

　　例：The conference will have lasted a full week by the time it ends.

　　會議從開始到結束將持續整整一個星期。

　　將來完成進行時：(will have been doing)

　　表示一個動作延續到將來某個時間，期間一直有規律在進行、不曾間斷，并且有可能繼續延續下去。

　　例：By the end of next month, the project will have been being worked for 3 years.

　　到下個月底為止，這項工程就已經不停地進行了3年了。