1. 過去完成時(shí)表示一個(gè)動(dòng)作或狀態(tài)在過去某一時(shí)間或動(dòng)作之前已經(jīng)完成或結(jié)束，即發(fā)生在“過去的過去”。如：

When I woke up, it had stopped raining.

我醒來時(shí)，雨已經(jīng)停了。(主句的動(dòng)作發(fā)生在“過去的過去”)

2. 過去完成時(shí)是一個(gè)相對(duì)的時(shí)態(tài)，表示的是“過去的過去”，只有和過去某一時(shí)間或某一動(dòng)作相比較時(shí)才使用它。如：

He told me that he had written a new book. (had written 發(fā)生在 told 之前 )

3. 過去完成時(shí)需要與一個(gè)表示過去的時(shí)間狀語連用，它不能離開過去時(shí)間而獨(dú)立存在。此時(shí)多與 already ， yet ， still ， just ， before ， never 等時(shí)間副詞及 by ， before ， until 等引導(dǎo)的短語或從句連用。

如：Before she came to China, Grace had taught English in a middle school for about five years.

Peter had collected more than 300 Chinese stamps by the time he was ten.

4. 過去完成時(shí)表示某一動(dòng)作或狀態(tài)在過去某時(shí)之前已經(jīng)開始，一直延續(xù)到這一過去時(shí)間，而且動(dòng)作尚未結(jié)束，仍然有繼續(xù)下去的可能。

如： By the end of last year, he had worked in the factory for twenty years. ( had worked 已有了 20 年，還有繼續(xù)進(jìn)行下去的可能)

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