4.過去完成時與一般過去時

　　(1) I came here after I finished middle schoo1．(兩個動作有間隔)

　　I came here after I had finished middle schoo1．(兩個動作有間隔，強調(diào)先后概念)

　　(2) I waited till I saw him．

　　I waited ti11 had seen him．(這兩個句子差別不大，過去完成時更普遍)

　　(3) We hoped he would come．(我們希望他來。)

　　We had hoped he would come．(我們本希望他來的。)

　　(4) I dont think he sang as well as he once did．(指具體一次)

　　I dont think he sang as well as he had once done．(泛指以前，現(xiàn)在可能不唱了)

　　(5) Before I came here，I was a soldier．(我來此以前在當兵。)

　　Before I came here，I had been a soldier．(我來此以前，曾當過兵。)

　　(6) Jim said he didnt know he was so strong．(表示Jim在說話時仍很結(jié)實)

　　Jim said he didnt know he had been so strong．(表示在Jim說話之前曾經(jīng)很結(jié)實)

　　(7) They were friends for many years．(表示現(xiàn)在還是朋友)

　　Thev had been friends for many years．(意味這友誼結(jié)束了)

　　(8) He did the work at 6．(強調(diào)時間)

　　He had done the work at 6．(6點工作已做完)

　　(9) I learned French during my holiday．(強調(diào)學了)

　　I had learned French during my holiday．(強調(diào)學會了)

　　(10) When she sang ，she sat down．(表示唱著坐下)

　　When she had sung ，she sat down．(表示唱完坐下)

　　(11) I went to bed when I did my homework．(不明確)

　　I went to bed when I had done my homework．(作業(yè)做完)

　　(12) I have lived here since I was a child．(從我長大成人)

　　I have lived here since I had been a child．(從我孩提時)