Period 4: Grammar
学习目标：
1. 理解并能够运用连词(but, however，although and while)
2. 了解不同连词的含义
3. 利用例句归纳出语法规则
学习重点：理解并能够运用连词(but, however，although and whi le)
学习难点：利用例句归纳出语法规则
课前预习
使用说明与学法指导：
1. 利用例句归纳出语法规则
2. 15分钟之内完成
预习自测：
观察下列从Reading and Vocabulary中选取的句子，体会连词but，however，although以及while的用法。
①Norway is at the top of the list，while the US is at number 7.
②The UK is in the thirteenth position，while China is in the middle of the list.
③However，the challenges are still great.Every day 799 million people in developing countries are hungry.
④Although more than 80% of children in developing countries go to primary school，about 115 million children are not being educated.
