同為完成進行時，過去將來完成進行時、現(xiàn)在完成進行時和將來完成進行時非常相似。不過歸根結(jié)底，只要弄清楚了時間點，就很好分辨了。

過去將來完成進行時
表示動作從過去某時間開始一直延續(xù)到對于過去來說的將來的某一個時間。
基本形式：should/would + have + been + doing

現(xiàn)在完成進行時
基本形式：have/has + been + doing
表示過去某時間點開始的動作或狀況一直持續(xù)到現(xiàn)在（可能繼續(xù)或就此停止）

將來完成進行時
基本形式：shall/will + have + been + doing
表示某種狀況一直持續(xù)到說話人所提及的時間。

例句對比：

（1）杰克工作。
Jack said that he would have been working hard by the end of the year.
Jack has been working hard.
Jack will have been working hard by the end of the year.

（2）演出持續(xù)了3個月。
By then the play would have been running for three months.
The play has been running for three months.
By then the play will have been running for three months.

（3）她將受到治療。
The doctor said that she would have been having treatment all her life.
She has been having treatment all day.
She will have been having treatment all her life.

（4）他生活在這里有10年了。
By the end of the month he would have been living here for ten years.
He has been living here for ten years.
By the end of the month he will have been living here for ten years.

（5）杰克會感覺很棒。
Her mother said that Jack would have been feeling very well.
Jack has been feeling very well recently.
Jack will have been feeling well.

從例子我們可以看出三者的主要區(qū)別為過去對未來的看法、現(xiàn)在的狀態(tài)和未來的事情。?