Section Ⅲ　Grammar--连　词

语 境 自 主 领 悟 先观察原句 后自主感悟 1.Norway is at the top of the list，while the US is at number 7.

2.In the last ten years in China，150 million people moved out of poverty.However，the challenges are still great.

3.Although more than 80% of children in developing countries go to primary school，about 115 million children are not being educated.

4.More than 1 billion people in developing countries do not drink safe water.However，in other regions of the world，e.g.Eastern Europe，water is now mostly safe to drink.

5.The report shows that we are making some progress but that we need to make greater efforts.

6.Although developed countries give some financial help，they need to give much more. 1.1句中while表示对比或相反的情况，意为"然而"。

2.由2、4、5句可知，but是一个并列连词，而however用作副词。

3.3、6句中although引导让步状语从句，可以与though互换。

　　连词是连接单词、短语、从句或句子的一种虚词，在句中不单独作任何成分，但大多数连接词都有具体的意义和用法。本单元主要学习表示转折关系的连词but，however，although/though，while等。

　　1．but和however的用法

　　两者都意为"但是；然而"，均表示转折关系，但用法有所不同。

　　(1)but用作并列连词，用来连接并列句子或并列成分，表示强烈对比、转折，两个并列成分之间可以用逗号隔开，也可不用，但是but后面不用逗号隔开。

　　He is a shy man，but he is not afraid of anything or anyone.

他是一个腼腆的人，但是他不害怕任何事情或任何人。