1、過去發生的兩個動作，先發生的用過去完成時
　　With their help I realized that I had been wrong.
　　2、過去某時以前發生的動作或情況
　　He hasn’t finished yet.
　　He didn’t finish yesterday evening.
　　He hadn’t finished by yesterday evening.
　　3、常用過去完成時的情況
　　①No sooner…than…. Hardly…when…
　　No sooner had he begun his speech than he was interrupted
　　②expect, hope, think, want, suppose等動詞的過去完成時（或一般時）表示想做而未做的事
　　I had planned to send him a telegram, but I didn’t manage it.
　　4、使用過去完成時的必要性和非必要性
　　①句意十分清楚時，可用一般時
　　After I finished, I went home.
　　②常用一般過去時表示依次發生的動作
　　I got out of the taxi, paid the fare（車費) and managed it.
　　③有時必須明確，特別是含when時
　　When I arrived, Ann left.
　　(同時見到）（見到Ann)
　　When I arrived, Ann had left.
　　（先后發生）（沒見到）
　　5、常用過去完成時的時間主狀語
　　by the end of +　過去時間 ； by + 過去時間
　　by the time + 過去時間；　過去時間 + before
　　比較：
　　By the time he was 11, he had learned 3000 words .
　　By the time he is 11, he will have learned 3000 words.
　　By the time last week, I had learned 3000 words.
　　By the time next week, I will have learned 3000 words