過去將來完成時的被動語態

一、我們來分析過去將來完成時時態，可以看出，過去將來完成時有3種時態，第一個是表過去的動作，第二個表將來，第三個表完成，而過去將來有可表示爲would/should do sth，完成時表示爲have done，因此過去將來完成時就可表示爲：would/should have done.例如：
He told me he would have finished it by the end of the next month.
他告訴我他下個月結束時他將完成它。

二、過去將來完成時的被動語態結構：should have been done , would have been done.例如：
1.I believed by the end of that year an advanced version of that software would have been developed, but I was wrong.
我堅信到那年年底爲止，那個軟件的新版本將被開發出來。但是我錯了。
2.He said that the garden shed would have been being cleaned for two hours by nine o’clock.
他說到九點爲止花園的小棚子將已經被打掃了兩個小時了。
3.It would have been completed before 8 o'clock.
它將會在八點之前被完成。
4.He said his work would have been finished by him the next day.
他說明天他將會完成他的工作。