“had been done”表示過(guò)去的過(guò)去，是過(guò)去完成的被動(dòng)態(tài)時(shí)。（當(dāng)你想說(shuō)發(fā)生在過(guò)去的兩件事時(shí)，就要分清誰(shuí)先誰(shuí)后。先發(fā)生的用過(guò)去完成時(shí)，后發(fā)生的要用過(guò)去時(shí)）。如：The rooms had been cleaned when I came. 我來(lái)的時(shí)候，房間已經(jīng)被打掃了。have/has been done是現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)。表示某事被做。

過(guò)去將來(lái)完成進(jìn)行時(shí)：(would have been doing)

表示動(dòng)作從過(guò)去某一時(shí)間開(kāi)始一直延續(xù)到過(guò)去將來(lái)某一時(shí)間，期間一直有規(guī)律在進(jìn)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(shuō)到第二個(gè)月底為止，這項(xiàng)工程就已經(jīng)不停地進(jìn)行了3年了。

將來(lái)完成時(shí)(will have done)

①表示一個(gè)動(dòng)作到將來(lái)某個(gè)時(shí)間為止已經(jīng)完成，強(qiáng)調(diào)對(duì)將來(lái)那個(gè)時(shí)間產(chǎn)生的影響。

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

早上8點(diǎn)鐘你來(lái)接我,到時(shí)我已經(jīng)吃完早飯了.

②表示一個(gè)動(dòng)作延續(xù)到將來(lái)某個(gè)時(shí)間，并且有可能繼續(xù)延續(xù)下去。

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

會(huì)議從開(kāi)始到結(jié)束將持續(xù)整整一個(gè)星期。

將來(lái)完成進(jìn)行時(shí)：(will have been doing)

表示一個(gè)動(dòng)作延續(xù)到將來(lái)某個(gè)時(shí)間，期間一直有規(guī)律在進(jìn)行、不曾間斷，并且有可能繼續(xù)延續(xù)下去。

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

到下個(gè)月底為止，這項(xiàng)工程就已經(jīng)不停地進(jìn)行了3年了。