4.过去完成时与一般过去时
(1) I came here after I finished middle schoo1.(两个动作有间隔)
I came here after I had finished middle schoo1.(两个动作有间隔,强调先后概念)
(2) I waited till I saw him.
I waited ti11 had seen him.(这两个句子差别不大,过去完成时更普遍)
(3) We hoped he would come.(我们希望他来。)
We had hoped he would come.(我们本希望他来的。)
(4) I dont think he sang as well as he once did.(指具体一次)
I dont think he sang as well as he had once done.(泛指以前,现在可能不唱了)
(5) Before I came here,I was a soldier.(我来此以前在当兵。)
Before I came here,I had been a soldier.(我来此以前,曾当过兵。)
(6) Jim said he didnt know he was so strong.(表示Jim在说话时仍很结实)
Jim said he didnt know he had been so strong.(表示在Jim说话之前曾经很结实)
(7) They were friends for many years.(表示现在还是朋友)
Thev had been friends for many years.(意味这友谊结束了)
(8) He did the work at 6.(强调时间)
He had done the work at 6.(6点工作已做完)
(9) I learned French during my holiday.(强调学了)
I had learned French during my holiday.(强调学会了)
(10) When she sang ,she sat down.(表示唱着坐下)
When she had sung ,she sat down.(表示唱完坐下)
(11) I went to bed when I did my homework.(不明确)
I went to bed when I had done my homework.(作业做完)
(12) I have lived here since I was a child.(从我长大成人)
I have lived here since I had been a child.(从我孩提时)