写作思路：从文章的写作目的、中心主旨入手，以使文章中心思想鲜明、深刻地表现出来，正文：
Dear teacher ,
亲爱的老师，
I am writing to you to express my thanks for your help in learning English and speaking English.
我写信给你，对你在学习英语和说英语方面的帮助表示感谢。
During these days in your class, I have learned much from you and it is very helpful to me. Firstly, you let me know what is the west thinking pattern—straight thinking pattern.
在你的课上，我从你身上学到了很多东西，这对我很有帮助。首先，你让我知道什么是西方思维模式——直思维模式。
And, I think, it is very important to understand the west’s thoughts. As you know, this can help me with my examination and interaction with foreigners.
而且，我觉得，了解西方的思想很重要。如你所知，这可以帮助我的考试和与外国人的互动。
Secondly, I have got enough confidence in speaking in English from your class and it took me a long time to gain this confidence. Now, I always express my ideas in English as possible as I can. It’s great to do that.
其次，我已经从你们班获得了足够的英语口语自信，并且花了很长时间才获得这种自信。现在，我总是尽可能用英语表达我的想法。这样做很好。
The last not the least, I find that learning English is not an boring thing as before and I’m interested in studying English which was just a necessary task to pass examinations. Reading, listening or speaking all become interesting and I really enjoy it.
最后同样重要的是，我发现学习英语并不像以前那样无聊，我对学习英语感兴趣，这只是通过考试的一项必要任务。
Above all, I want to say thanks again to you. And thank you for your time.Good luck.
阅读、听力或口语都变得有趣，我真的很喜欢。最重要的是，我想再次感谢你。谢谢你抽出时间。祝您好运。
亲爱的先生：
I am very glad that you are my teacher,You are one of the best teachers who I know .
我很高兴你是我的老师，你是我认识的最好的老师之一。
there are many good points what we should learn from you,such as kindness,patience,humor and so on.
我们应该从你身上学到很多优点，比如善良、耐心、幽默等等。
please forgive me that I had made so many mistakes which make you always angry.I really want to be a good student.
请原谅我犯了那么多的错误，总是让你生气。我真的想做一个好学生。
Thanks for you teaching ,I have learn so many interesting things ,so many words,so many sentencesform you,Ican feel that it is not only a progress of learning,but also a convarcation of feeling 。
谢谢你的教诲，我学到了那么多有趣的东西，那么多的文字，那么多的句子，我觉得它不仅是学习的进步，也是感情的一种境界。
You are my teacher and good friend, We are the lucky dogs that we have such teacher as you.finally，I hope you happy everyday!
你是我的老师和好朋友，我们是幸运的狗，我们有像你这样的老师。最后，我希望你每天快乐！
best wishes
最美好的祝福
your student
你的学生
dd mm yy
DD MM YY