(
课件网) Exercise He is very young, _____ he knows a lot about computer. A. and B. however C. but D. while 2. Excuse me for breaking in, _____ I have some news for you. A. so B. and C. but D. yet C C 3. Some people waste a lot of food _____ others haven’t enough to eat. A. however B. when C. as D. while 4. _____ he had to write a history paper. _____ he couldn’t find time to do it. A. Although; but B. Although; / C. Even though; / D. Even if; / D B Explanation: but, however, although, while 1. 连接两个并列分句 Honey is sweet, but the bee stings. 1. but 主 系 表 主 谓 提示：所谓并列分句就是连词前后都是完整的句子 2. 连接两个并列成分 They see the trees but not the forest. He no longer felt disappointed, but happy and hopeful. 3.后接状语 He tried to save it, but in vain. (介词短语作状语) He glanced about, but seeing only the empty room. ( v-ing 短语作状语) 并列结构 2. however 1. 多插在句子中间 His first response was to say no. Later, however, he changed his mind. 2.有时也放在句首或句尾 I’ll offer it to Tom. However, he may not want it. （放在句首） You know all this as well as I do, however. （放在句尾） 通常用逗号和句子的其他成分隔开 3. although 常用来引导让步状语从句, 与though同义 Although it was barely four o’clock, the lights were already on. (可以放在句首) He said they were married, although I’m sure they aren’t. (可以放在句中) He’s very lovable although (he is) not at all tidy. although侧重的是一种情况下 或者是一件事的转折 4. While 用来引导状语从句，表示对比、让步、时间等。 Some countries are rich, while others are extremely poor. （对比） While Tom’s very good at science, his brother is absolutely hopeless. （对比） While they are my neighbors, I don’t know them well. （让步） Strike while the iron is hot. （时间） 归纳： (1)but和however 相同：都表示“但是、然而” 不同： however既可以放在句首也可以放在句 中句末，并且后面一般要有逗号 but常用于句中，不加逗号 (2) while与but 相同：都有“然而、而”的意思 不同：while强调两者的对比，而but强调转折 (3) while与although 相同：都可用来表示让步 不同：while是并列连词，还可表示对比和时间 although为从属连词，只引导让步状语从句 Practice _____ you call me to say you’re not coming, I’ll see you at the theatre. Though B. Whether C. Until D. Unless 2. I do every single bit of housework____ my husband Bob just does the dishes now and then. A. since B. while C. when D. as D B 3. Paul had to write a history paper, _____ he couldn’t find time to do it. A. but B. so C. because D. if You should try to get a good night’s sleep____ much work you have to do. however B. no matter C. although D. whatever A A No matter how much work you have to do 5. _____ I accept that he is not perfect, I do actually like the person. A. While B. Since C. Before D. Unless 6. Tom was about to close the windows _____his attention was caught by a bird. A. when B. if C. and D. while A A be about to do … when … 当某事在发生时，另一件事正在发生 7. (四川)Owen wouldn’t eat anyth ... ...
