大学英语六级的作文怎样写好主题句

主题句是表达段落主题的句子。它用以概括段落大意，要求全段其他文字都围绕它展开。请看下例：

My mother has passed along to me certain rules for getting along with others. Dont argue with parents; they will think you dont love them. Dont argue with children; they will think themselves victimized. Dont argue with spouses; they will think you are a tiresome mate. Dont argue with strangers; they will think you are not friendly. My mothers rules, in fact, can be summed up in two words: Dont argue.

主题句中提出的certain rules指的是什么?展开句中通过四个Dont argue -- 逐一加以交代。从结构来看，这是一个比较典型的段落，它包括了主题句，推展句和结论句。

1.1 主题句的.位置

主题句通常放在段落的开端，其特点是开门见山地摆出问题，然后加以详细说明。其作用是使文章的结构更清晰，更具说服力，便于读者迅速地把握主题和想象全段的内容。主题句可以放在段中起到承上启下的作用，或放在段尾起概括全段的作用。但初学者比较难于掌握，因而在六级考试中，考生应尽量采用将主题句放在段落开头的写作手法。

例1: Our life today depends very much on energy. In towns and in villages, on farms and in factories, machines have made life easier than it used to be. The machines use energy, and energy is needed for heating, lighting, communications, carrying goods -- everything. Factories and industrial plants use a great deal of energy to make the things that we use and buy and sell.，