新概念3第六课最后一句不明白她的语法TheexpensiveshopsinafamousnearPiccadillywerejust"opening.Atthistimeofthemorning,thearcadewasalmostempty.Mr.Taylor,theownerofajewelleryshopwasadmiringanewdisplay.Twoof

Question

新概念3 第六课 最后一句不明白她的语法
The expensive shops in a famous near Piccadilly were just "opening.At this time of the morning,the arcade was almost empty.Mr.Taylor,the owner of a jewellery shop was admiring a newdisplay.Two of his assistants had been working busily since eight o'clock and had only justfinished.Diamond necklaces and rings had been beautifully arranged on a background of blackvelvet.After gazing at the display for several minutes,Mr.Taylor went back into his shop.
The silence was suddenly broken when a large car,with its headlights on and its home blaring,roared down the arcade.It came to a stop outside the jeweller's.One man stayed at the wheelwhile two others with black stocking over their faces jumped out and smashed the window ofthe shop with iron bars.While this was going on,Mr.Taylor was upstairs.He and his staffbegan throwing furniture out of the window.Chairs and tables went flying into the arcade.Oneof the thieves was struck by a heavy statue,but he was too busy helping himself to diamondsto notice any pain.The raid was all over in three minutes,for the men scrambled back into thecar and it moved off at a fantastic speed.Just as it was leaving,Mr.Taylor rushed out and ranafter it throwing ashtrays and vases,but it was impossible to stop the thieves.They had gotaway with thousands of pounds worth of diamonds.
最后一句为什么用过去完成时啊

Answer 1

最后几句话是紧密呼应的：
Mr.Taylor 力图不让那些贼逃跑—— to stop the thieves,但这是不可能的（but it was impossible）,为什么呢?因为在前面已提到：汽车“it move off at a fantastic speed”,所以 Mr.Taylor 在它后面 “throwing ashtray and vases ” 根本掷不到车上,在那些东西到达前,车子早已开跑了.最后一句话用过去完成式表示的就是这个意思 .
本文用的是过去式,“They had got away with…… ” 与 一般过去式“Mr. Taylor rushed out and ran after it throwing……” 相呼应,表示贼人逃跑在先,追赶在后,使得 “but it was impossible to stop the thieves” 很清晰.
供你参考.