2012届高考英语一轮复习综合训练(课件)：Unit_16_Stories(北师大版选修6).ppt

6．As Helen’s knowledge and vocabulary expanded，she asked more and more questions. 随着海伦知识和词汇的增加，她问的问题越来越多了。 【精讲拓展】 (1)more and more 表示越来越多；比较级＋and＋比较级表示越来越…… Why are more and more people in China interested in learning English?为什么在中国越来越多的人对学习英语感兴趣？ John ran faster and faster on the last lap. 约翰在最后一圈时跑得越来越快。 Our city is getting more and more beautiful. 我们的城市变得越来越美丽。 (2)as引导时间状语从句，意为“随着，当……的时候”。 【归纳拓展】 as作连词的用法： (1)作“当……的时候”，引导时间状语从句。注意与when, while的用法区别。 ① when作“当……的时候”解，可以指较短的(一点)时间，也可指一段时间，即非延续性动词。 When he was at college，he could speak several foreign languages. When the clock struck twelve，all the lights in the street went out. ② while常表示一段较长的时间或一个过程，即延续性动词。强调主句谓语动词与从句谓语动词同时发生。 Work while you work.Play while you play. ③但属下列情形时，只用as，而不用when或while。 a．用于表示同一个人的两个动作交替进行，指“一边……，一边……”。 The girl dances as she sings on the stage. He looked behind from time to time as he went forward. b．表示两个同步发展的动作或行为，译为“随着……”。 As time went on/by，she became more and more worried. As children get older，they become more and more interested in the things around them. c．后接名词表示某一年龄段时，用as。 As a young man，he was active in sports. (2)as＝since，作“既然”“由于”解，引导原因状语从句，常用来表示已为人们所知或显而易见的原因或理由。 As/Since you’re not feeling well，you may stay at home. As he wasn’t ready in time，we went without him. (3)as＝in the way that，作“像”“按照……的方式”解，引导方式状语从句。 He speaks English as Americans do. Remember，you must do everything as I do. (4)用于as...as...或not so/ as...as...中，前一个as是副词，后一个as是连词，引导比较状语从句。 They helped the old man as often as possible. I don’t speak English so/ as well as he does. (5)作“虽然”“尽管”解，引导让步状语从句。常用倒装语序，即adj./adv./n.＋as ＋主语＋谓语＋主句。 Tired as they were，they walked on.Child as he is，he knows a lot.(child前不用冠词) 4．end up以……结束，告终 【精讲拓展】 end up＋prep. end up with end up＋adj. end up doing... at the end (of) 在(……的)末端 be at an end 结束，终结 by the end of 到结束时,到末尾时 come (draw) to an end 结束，完结 put an end to sth. 结束某事 in the end