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过去完成时和过去完成进行时
2007-08-16 10:10:56
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 过去完成进行式(Past Perfect Progressive Tense)
过去完成式的形式如下:
had + past participle
过去完成式是不能单独用的。我们用的时候,必须有另一个事件。也就是说,假如我们有两件事 A 和 B,两件事都发生在过去,但 A 发生在 B 以前,A 应该用过去完成式,B 则用过去式。以下是几个例子:
(1)  他到台湾以前,曾学过中文。
He had studied Chinese before he came to Taiwan.
(2)  他念大学以前,曾前工作过。
He had worked before he decided to go to college.
(3)  我写这篇有关爱尔兰的小说以前,曾去过爱尔兰。
I had been to Ireland before I wrote this book about Ireland's people.
(4)  我在上大学以前,已经学过微积分。
I had studied calculus before I got into college.
(5)  周一以前,已经下过雪了。
It had already snowed before Monday.
如果我们要强调较早发生事件的连续性,我们可以用过去完成进行式。占去完成进行式和现在进行式惟一不同的地方是 verb to have 的地方一定要用had 。以下是一些过去完成进行式的例子:
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.
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