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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. (责任编辑：admin) |