举例、比较、换言--四级作文主体段落三大杀手锏

　　一、举实例

　　In order to attract more customers, advertisers have adopted every possible stimulative factor in making ads, such as sound, light, colours, cartoon films and human performance. For instance, to advertise a certain food, advertisers will ask an actor or actress to sit at a table and devour the seemingly delicious food while they film him or her.

　　二、做比较

　　方法：写完一个要点，比较与之相似的；又写完一个要点，再比较与之相反的；

　　相似的比较：in comparison, likewise, similarly, in the same manner

　　相反的比较：on the other hand, conversely, whereas, while, instead, nevertheless, in contrast, on the contrary, compared with ,

　　三、换言之

　　I am enthusiastic about you. That is to say, I love you.

　　I am wild about you. In other words, I have fallen in love with you.

　　结尾

　　结尾需要灵活创造。一般的习惯是，一些记叙文和描写文经常采用自然结尾的方法；但说理性和逻辑性较强的说明文和议论文则往往都有结束语，以便使文章首尾呼应，结构完整。