專門替中國人寫的英語語法4-3：過去完成進行式（Past Perfect Progressive Tense）

　　4-3 過去完成進行式(Past Perfect Progressive Tense)

　　過去完成式的形式：had + past participle

　　過去完成式是不能單獨用的。我們用的時候，必須有另一個事件。也就是說，假如我們有兩件事 A 和 B，兩件事都發(fā)生在過去，但 A 發(fā)生在 B 以前，A 應該用過去完成式，B 則用過去式。以下是幾個例子：

　　(1)他到臺灣以前，曾學過中文。

　　He had studied Chinese before he came to Taiwan.

　　(2)他念大學以前，曾前工作過。

　　He had worked before he decided to go to college.

　　(3)我寫這篇有關愛爾蘭的小說以前，曾去過愛爾蘭。

　　I had been to Ireland before I wrote this book about Ireland's people.

　　(4)我在上大學以前，已經(jīng)學過微積分。

　　I had studied calculus before I got into college.

　　(5)周一以前，已經(jīng)下過雪了。

　　It had already snowed before Monday.

　　如果我們要強調(diào)較早發(fā)生事件的連續(xù)性，我們可以用過去完成進行式。

　　過去完成進行式和現(xiàn)在進行式惟一不同的地方是 verb to have 的地方一定要用had 。

　　以下是一些過去完成進行式的例子：

　　1.I had been watching TV before you called me.

　　2.I had been working hard in a company for many years before I went to college.

　　3.He had been studying before he went to class.

　　4.He had been driving all day before he went to sleep.