在英語過去完成進(jìn)行時中，例如 work、study、stay、sing、teach等延續(xù)性動詞與表示一段時間的時間狀語連用時，用過去完成進(jìn)行時可以表示一個動作一直延續(xù)到過去某一時刻，通常強調(diào)動作的持續(xù)性和不間斷性。例如：
1.She had been studying for two hours when her classmate came to visit her.
當(dāng)她的同學(xué)來看她的時候，她學(xué)習(xí)有兩個小時了。
2.I had been writing a letter for two hours by the time she came to see me.
當(dāng)她來看我的時候，我已經(jīng)寫了兩個小時的信了。

3.They had been having breakfast for ten minutes when Tom came in.
湯姆來時，他們已經(jīng)吃了十分鐘的早飯了。

4.She had been dancing for one hours when her mother came back home.
當(dāng)她的媽媽回到家時，她跳舞有一個小時了。
5.I had been reading this book for three hours by the time she came to see me.
當(dāng)她來看我的時候，我已經(jīng)讀了三個小時的書了。

6.They had been having class for twenty minutes when Tom came in.
湯姆來時，他們已經(jīng)上了二十分鐘的課了。

7.My father had been watching TV for two hours when his friend came to visit him.
當(dāng)他的朋友來看他的時候，我的父親已經(jīng)看了兩個小時電視了。

8.Tom had been playing piano for two hours by the time Lily came to see him.
當(dāng)麗麗來看他的時候，湯姆已經(jīng)練習(xí)鋼琴兩個小時了。

9.We had been talking about this project for one hour when manager came in.
經(jīng)理來時，關(guān)于這個項目，我們已經(jīng)討論了一個小時了。