要用過去將來完成進行時態進行造句，首先要了解過去將來完成進行時態的基本結構。完成進行時態是英語中的四大時態之一，它的結構是have/has been doing。而過去將來完全進行時態的結構就是would have been doing。
如：He said he would have been doing his work.
I heard by June he'd have been teaching English there for two years. 我聽說到六月前他就在那教了2年的英語。
