正反对比的写作：比如Generation gap between parents and children（父母和孩子之间的代沟），文章结构如下：
Introduction: （介绍中心思想） The differences between parents and children can be well observed in their completely different attitudes and views.（提出对比点：对生活态度和待事观点的差异） Body:（正文）
Point 1: different in their attitude toward life Point 2: different in the way to look at things
Conclusion:（得出结论） It’s very difficult for parents and their youngsters to get along due to their distinct attitudes toward life and the way to view things.
表对比的常用连词及句型
1. by contrast
Those that do not, by contrast, run the risk of serious brand damage. 对比而言，不这样做的企业就会有严重破坏品牌形象的风险。 2. on the contrary
On the contrary, I admire her intellectual honesty and her pursuit of self-knowledge.
相反的是，我欣赏她充满智慧的直白和对自我认识的追求。 3. whereas
He had never done anything for them, whereas they had done everything for him.
他从未为他们做过任何事，反之他们却为他做了所有事。 4. on the other hand
On the other hand, it just works. 另一方面，这种方法的确有效。 5. unlike
Unlike my uncle, I likely like that bike (bicycle). 我不像叔叔，我很可能喜欢那辆自行车。 6. instead
She frittered away her time in going to the cinema instead of studying.
她不把时间花在学习上，而是浪费在看电影上了 7. conversely
Conversely, if you turn off your creativity, then your life will turn into torture.
相反的，如果你放弃创造力你的生活将变得痛苦。 8. different from
And yet our case was so different from that of Europe. 然而，我们这边的情况和欧洲是那样地不同。 9. in contrast
In contrast, some humans are delighted by the new warmth. 相反，某些人却因为这新的温暖而高兴。
