【主题分类】写作：书信

【结构梳理】

    一、表明写信目的，表达感谢之情

    二、说明事情缘由

    三、再次表达感激之情

【关键句型】

1    1. Extend my sincere gratitude to…对……表示衷心感谢

      2. Be addicted to 沉溺于……中

      3.Whopping one-quarter of waking hours 除了睡觉其余时间的四分之一

      4.Substitution for real-life human connection

        替代现实生活中的人际关系

      5.Be deeply indebted to you for因……而深深地感激你

【参考范文】

Dear Roger，

I am writing to extend my sincere gratitude to you. It is very kind of you to help me out when I was in difficulty.

As you may know，I have been addicted to the Internet for quite a while. Every day I would spend a whopping one-quarter of waking hours in the virtual world connecting with people on the net，as a substitution for real-life human connection. Having realized the harmful effects of excessive use of the Internet，you made great efforts to discourage me from Internet addiction. Fortunately, with your persistent support and selfless assistance，I have freed myself from Internet obsession now. A friend in need is a friend indeed; I am deeply indebted to you for your timely help and l will cherish our friendship forever no matter what happens. Again，please accept my heartfelt appreciation.

　　                                                                                                   Sincerely                                                                                                            yours，

　　                                                                                                   Li Ming