摘要： (教师让学生判断一组句子陈述的是否是改善环境的行为.引出语法 while, but, and, or引导的并列句.) 1.We should use plastic bags as few as possible. 2.We should throw the rubbish in the river. 3.We should reduce the waste we produce. 4.We should use both sides of paper. 5.We should throw the plastic bags rather than reuse them. T: Look at the five sentences. If you think the statement is good for our environment, you nod your head, and it means agreement, (教师做点头状并重复读nod.) or you shake your head, and it means disagreement. nod, agreement, shake (教师出示小黑板上的句子.讲解while, but, and, or引导的并列句.) 1. You nod your head, and it means agreement. 2. Nod your head, or shake your head. 3. Water is important, but some people don’t save it. 4. Some people protect animals while others kill animals. (教师让学生仔细看画线部分的单词在句中起到什么作用.并且看前后两个句子是什么关系.) T: Let’s look at the sentences. Pay attention to the words underlined. What’s the function of them? What’s the relation of the two parts in each sentence? (让学生讨论后.教师与学生一起分析这些句子.然后教师引导学生.师生一起总结并列句.) 1. 并列句的定义 2. 并列句的用法 (1)表示并列关系.用and-- (2)表转折.用but, while-- (3)表选择.用or--

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