1、SENTENCE EXPLANATIONS，Book 6 Unit 4请和你的同学一起认真分析下列句子，并补全所缺内容。这种学习方式能逐步提高你理解长难句的能力。1. That probably does not seem much to you or me, but it is a rapid increase when compared to other natural changes. (P26)【分析】 本句是一个由but连接的并列句。 在第二个分句中，when compared to other natural changes作时间状语，when后省略了it is。 【仿写】太平洋是
2、世界上最大的海洋，但与整个地球相比，它一点也不显得大。 The Pacific is the largest ocean in the world, but it does not seem big at all _.2. There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a random but natural phenomenon. (P26)【分析】 本句的结构为：主句（There
3、 is no doubt）+同位语从句1（that the earth is becoming warmer）+ and +同位语从句2（that it is human activity . natural phenomenon）。 There is no doubt that . 是固定句型，意为“毫无疑问”。 在第二个同位语从句中使用了强调句型，强调human activity。【仿写】毫无疑问，鲍勃不得不放弃这次机会，是他父亲让他做出的这个决定。_ that Bob will have to give up the chance and that _ made him make thi
4、s decision.3. On the other hand, there are those, like George Hambley, who are opposed to this view and believe that we should not worry about high levels of carbon dioxide in the air. (P27)【分析】 本句是一个复合句。 主句是There are those，后面跟一个由关系代词who引导的定语从句修饰先行词_, who在从句中作主语。like George Hambley在句中作插入语。 定语从句中又包含由
5、and连接的并列成分。believe后跟的是that引导的宾语从句。4. It will make plants grow quicker; crops will produce more; it will encourage a greater range of animals all of which will make life for human beings better. (P27)【分析】 本句的结构为：并列分句1（It will make plants grow quicker）+并列分句2（crops will produce more） +并列分句3（it will encourage a greater range of animals） +定语从句（all of which will make life for human beings better）。 在定语从句中，which指代前面三个并列分句所表达的内容。答案1.【仿写】when compared to the whole earth2.【分析】There is no doubt; it is his father that3.【分析】those
