來源:網(wǎng)絡資源 2023-10-01 21:11:19
1. 過去完成時表示一個動作或狀態(tài)在過去某一時間或動作之前已經(jīng)完成或結束,即發(fā)生在"過去的過去"。如:
When I woke up, it had stopped raining.
我醒來時,雨已經(jīng)停了。(主句的動作發(fā)生在"過去的過去")
2. 過去完成時是一個相對的時態(tài),表示的是"過去的過去",只有和過去某一時間或某一動作相比較時才使用它。如:
He told me that he had written a new book. (had written 發(fā)生在 told 之前 )
3. 過去完成時需要與一個表示過去的時間狀語連用,它不能離開過去時間而獨立存在。此時多與 already , yet , still , just , before , never 等時間副詞及 by , before , until 等引導的短語或從句連用。
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. 過去完成時表示某一動作或狀態(tài)在過去某時之前已經(jīng)開始,一直延續(xù)到這一過去時間,而且動作尚未結束,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)進行下去的可能)
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