3、于句首、句中或句末。位于句中时，常用逗号或分号与前后分开；but常位于句中，也可位于句首，但是不用标点符号与后面隔开。(2)but可以连接两个并列分句或并列成分。(2008年湖南卷)I thought we’d be late for the concert, ______ we ended up getting there ahead of time. A. but B. or C. so D. for[点拨]A 考查连词的用法。根据句子间的逻辑关系可以得知，后面句子表示与前面预料的相反的情况，句子间为转折关系。5.although与while表示对
4、比 although与while都可以用来表示同类的对比，比较人与人，或是情况、事情之间。但是它们在具体用法上却不一样。(1)Although是从属连词，引导让步状语从句；while是并列连词。(2)Although从句的复合句可以转化成为由but引导的并列从句，但是although和but不能同时用。(3)while表示两件事情的对比时也可以与but转换，不过这时but也是表示对比的，而不能是表示转折的。考题例证1.（2010全国卷I）Mary made coffee _______ her guests were finishing their meal. A so that B
5、although C while D as if[点拨]C考查连词的用法。While在句子中表示两件事情的对比，Mary在泡咖啡，而她的朋友们在吃饭。2. (2007山东卷)_____ I don't like art, I fond his work impressive.A. As B. Since C. If D. While[点拨]D while此处用作虽然、尽管的意思，引导让步状语从句。[自主检测]（一）基础知识——必会题1. I can't_____ what has happened to the vegetables, for they
6、were fleshly picked this morning. A. look out B. take out C. work out D. figure out2. The soldiers have to stand for hours without changing_______. A. position B. state C. situation D. location3. --What should we do then? We still have
7、half an hour before the basketballgame.-- _______. Whatever you want to do is fine with me. A. It all depends. B. It's up to you C. All right D. Glad to hear that4. ____
