新概念3 第六课 最后一句不明白她的语法

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

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.
再问： 好复杂 这个语法 不是单纯能看出来的
再问： 好复杂 这个语法 不是单纯能看出来的
再答： 请你复习一下过去完成式的语法，多看一些例句。
关于过去完成式以及过去完成进行式在同书第10课的 Key Structures 中有提示 ，要求复习第二册212页的 K。S。，在212页的K。S。中，又提示你去复习 39，97，153 页的 K。S。。
学习 N。C。E。就要按照它的要求来学，我就是这样学过来的。
再问： 我知道过去完成时 是过去的过去 但是这个句子只有一个动词 他要和 之前的不是一个句子里的动词进行比较 着我感觉是个难度 我意识不到这一点
再答： 虽然不是在同一个句子里，但还是在同一段落里。这正是我们要下工夫学习的。你学得这样认真，一定能学懂的。以前我在学这课时，就没有你这样认真。
上次我提到的 Key Structures ，页数是按老版本，新版本的可能不同。我之所以说那些话，用意是提醒你在学第三册时经常要复习第二册的内容，因为这是这套书的特点。